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[Member] Nippon Shinyaku Co., Ltd. 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Total operating expenses Costs and Expenses Class of Stock [Axis] Class of Stock [Axis] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Entity Registrant Name Entity Registrant Name Acquisition-related Costs Acquisition-related Costs [Member] Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Work in process Inventory, Work in Process, Net of Reserves Zepzelca Zepzelca [Member] Zepzelca 2021 Credit Agreement, Revolving Credit Facility Two Thousand Twenty One Credit Agreement, Revolving Credit Facility [Member] Two Thousand Twenty One Credit Agreement, Revolving Credit Facility Thereafter Finance Lease, Liability, To Be Paid, After Year Four Finance Lease, Liability, To Be Paid, After Year Four Financial Instrument [Axis] Financial Instrument [Axis] Selling, general and administrative Selling, General and Administrative Expenses [Member] Ordinary shares issued to GW ADS holders (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Accrued liabilities Total accrued liabilities Accrued Liabilities, Current Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Summary Of Deferred Revenue [Table] Summary Of Deferred Revenue [Table] Summary Of Deferred Revenue [Table] Less imputed interest Finance Lease, Liability, Undiscounted Excess Amount Finished goods Inventory, Finished Goods, Net of Reserves Asset Derivatives Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement Employee Stock Option Share-based Payment Arrangement, Option [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Closing price of ordinary shares (USD per share) Business Acquisition, Equity Interest Issued or Issuable, Share Price Business Acquisition, Equity Interest Issued or Issuable, Share Price Total Oncology Oncology [Member] Oncology Measurement Input Type [Domain] Measurement Input Type [Domain] Interest income from available-for-sale securities Investment Income, Interest Ordinary Shares Common Stock [Member] Variable Rate [Axis] Variable Rate [Axis] Schedule of Lease Supplemental Balance Sheet Information Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Other comprehensive loss before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Finance leases Finance Lease, Weighted Average Remaining Lease Term Income from operations Operating Income (Loss) Cardinal Cardinal Health Inc. [Member] Cardinal Health Inc. 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Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). 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Acquisition accounting inventory fair value step-up adjustment Inventory Step-Up Value Adjustment The noncash expense recognized in the current period from the amortization of acquired inventory written up to fair value in purchase accounting Sativex Sativex [Member] Sativex Total current assets Assets, Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Total lease payments Lessee, Operating Lease, Liability, to be Paid Gross accounts receivable Accounts Receivable [Member] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Inventories Total inventories Inventory, Net Loss reclassified from accumulated other comprehensive income (loss) to interest expense, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Sunosi Sunosi [Member] Sunosi [Member] Entity File Number Entity File Number Shares repurchased Stock Repurchased During Period, Value Performance-Based Restricted Stock Unit Awards Share-based Payment Arrangement [Policy Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Payment terms, range Revenue, Performance Obligation, Payment Terms Revenue, Performance Obligation, Payment Terms Inventory-related accruals Accrued Inventory Related Liabilities Accrued Inventory Related Liabilities Current portion of long-term debt Less current portion Long-term Debt, Current Maturities Product and Service [Axis] Product and Service [Axis] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Smaller Reporting Company Entity Small Business Equity securities without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount Weighted-average grant date fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Equity Component [Domain] Equity Component [Domain] Short-term lease cost Short-term Lease, Cost Debt Instrument, Redemption, Period Three Debt Instrument, Redemption, Period Three [Member] 2022 Lessee, Operating Lease, Liability, to be Paid, Year One Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Schedule of Gross Carrying Amounts and Net Book Values of Intangible Assets Schedule Of Finite Lived And Indefinite Lived Intangible Assets [Table Text Block] Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance, both finite life and indefinite life, by major class. 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Inventories Increase (Decrease) in Inventories Schedule of Weighted Average Assumptions for Fair Values of Stock Options [Table] Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Table] Schedule of Weighted Average Assumptions for Fair Values of Stock Options [Table] Accrued royalties Accrued Royalties, Current Capital Redemption Reserve Capital Redemption Reserve [Member] Capital Redemption Reserve [Member] Financial Instruments [Domain] Financial Instruments [Domain] Derivative [Table] Derivative [Table] Net Amount Derivative Liability, Fair Value, Amount Offset Against Collateral Revenues: Revenues [Abstract] De-recognition of operating lease liability on lease assignment De-recognition Of Operating Lease Liability On Lease Assignment De-recognition Of Operating Lease Liability On Lease Assignment Non-cash interest expense Noncash Interest Expense Noncash Interest Expense Issuance of ordinary shares in conjunction with vesting of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Acquisition of intangible assets Payments to Acquire Intangible Assets Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Partial repurchase of Exchangeable Senior Notes, due 2021 Adjustments To Additional Paid In Capital, Convertible Debt With Conversion Feature, Repurchase Adjustments To Additional Paid In Capital, Convertible Debt With Conversion Feature, Repurchase Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Deferred charge for taxes on intercompany profit Deferred Tax, Intercompany Profit, Current Deferred Tax, Intercompany Profit, Current GW Pharmaceuticals plc GW Pharmaceuticals plc [Member] GW Pharmaceuticals plc Net lease cost Lease, Cost Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Term Debt Instrument, Term Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Term Loan Term Loan [Member] Term Loan [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Term Loan Facility Term Loan Facility [Member] Term Loan Facility Other non-current liabilities Other Liabilities, Noncurrent Manufacturing contracts Manufacturing Contracts [Member] Manufacturing Contracts [Member] Pro Forma Pro Forma [Member] Gross Amounts Offset in the Consolidated Balance Sheet Derivative Asset, Fair Value, Gross Liability Rylaze Rylaze [Member] Rylaze Schedule of Long-term Debt Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Estimated Future Amortization Costs Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and 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debt, less current portion Total long-term debt Long-term Debt, Excluding Current Maturities Liabilities: Liabilities, Fair Value Disclosure [Abstract] Capital redemption reserve Capital Redemption Reserve Capital redemption reserve created under Irish company law to preserve permanent capital in the company. Total share-based compensation expense, pre-tax Share-based Payment Arrangement, Expense Exchangeable Senior Notes Convertible Debt Securities [Member] Europe Europe [Member] Net income (loss) per ordinary share: Earnings Per Share, Basic and Diluted [Abstract] Document Fiscal period Focus Document Fiscal Period Focus Ordinary Shares Ordinary Options Ordinary Shares [Member] Ordinary Shares [Member] Acquisition costs not expensed during period Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs Not Expensed During Period Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs Not Expensed During Period Construction-in-progress Construction in Progress [Member] Weighted-average discount rate Weighted Average Discount Rate [Abstract] Weighted Average Discount Rate Cash and cash equivalents, at beginning of period Cash and cash equivalents, at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents United States UNITED STATES Measurement Input, Discount Rate Measurement Input, Discount Rate [Member] Range of risk-free rates, maximum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Income taxes payable Taxes Payable, Current Current assets: Assets, Current [Abstract] Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Interest expense, net Interest Income (Expense), Nonoperating, Net Leases [Abstract] Leases [Abstract] Entity Central Index Key Entity Central Index Key London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Security Exchange Name Security Exchange Name Liability Derivatives Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Issuance of ordinary shares in conjunction with exercise of share options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Weighted-average ordinary shares used in per share calculations - diluted (in shares) Weighted-average ordinary shares used in per share calculation - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Recurring Fair Value, Recurring [Member] Income Taxes Income Tax Disclosure [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Loss recognized in foreign exchange gain (loss) Gain (Loss) on Fair Value Hedges Recognized in Earnings Denominator: Denominator [Abstract] Denominator [Abstract] Net Unrealized Loss From Hedging Activities Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] November 2016 Share Repurchase Program November 2016 Share Repurchase Program [Member] November 2016 Share Repurchase Program [Member] Schedule of Weighted-Average Ordinary Shares Excluded from Computation of Diluted Net Income (Loss) per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Accrued interest Accrued Interest Carrying value as of the balance sheet date of obligations incurred through that date and payable for interest. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). 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[Member] Cost Of Product Sales Adjustment Foreign exchange forward contracts Foreign Exchange Forward [Member] Operating cash outflows from finance leases Finance Lease, Interest Payment on Liability Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Foreign exchange Goodwill, Foreign Currency Translation Gain (Loss) Money market funds Money Market Funds [Member] Loss Contingencies [Table] Loss Contingencies [Table] Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Ownership [Domain] Ownership [Domain] Jazz Securities Designated Activity Company Jazz Securities Designated Activity Company [Member] Jazz Securities Designated Activity Company Entity Address, Postal Zip Code Entity Address, Postal Zip Code Avadel Pharmaceuticals plc Lawsuit Avadel Pharmaceuticals plc Lawsuit [Member] Avadel Pharmaceuticals plc Lawsuit Unamortized discount and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Derivative Financial Instruments Derivative, Collateral, Obligation to Return Securities McKesson McKesson Corporation [Member] McKesson Corporation [Member] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] 2021 (remainder) Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security Statement [Table] Statement [Table] Other current assets Other current assets Other Assets, Current GW ADS Outstanding May 5, 2021 (in shares) Business Combination, Number Of American Depository Shares Acquired Business Combination, Number Of American Depository Shares Acquired Adoption of New Accounting Standards and Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Other non-current assets Increase (Decrease) in Other 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Note [Abstract] Finance lease, liability, noncurrent Finance Lease, Liability, Noncurrent Total Finite-Lived Intangible Assets, Net Goodwill Goodwill Goodwill, beginning of period Goodwill, end of period Goodwill Cost of product sales Cost of Sales [Member] Inventories Inventory, Policy [Policy Text Block] Schedule of Gross Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Scenario [Domain] Scenario [Domain] Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Schedule of the Fair Value of Outstanding Derivatives Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Acquired developed technologies Developed Technology Rights [Member] Operating lease cost Operating Lease, Cost Computer equipment Computer Equipment [Member] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Transactions costs incurred during period Business Acquisition, Transactions Costs Incurred During Period Business Acquisition, Transactions Costs Incurred During Period Inventory [Line Items] Inventory [Line Items] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Debt Long-term Debt [Text Block] Deferred tax provision (benefit) Deferred Income Tax Expense (Benefit) GW Litigation GW Litigation [Member] GW Litigation Accrued construction-in-progress Accrued Construction-In-Progress Carrying value as of the balance sheet date of obligations incurred through that date and payable for construction-in-progress. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).