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[Abstract] Total shareholders’ equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Concentration Risk Type [Domain] Concentration Risk Type [Domain] Tender offer, per share amount offered, cash (in dollars per share) Tender Offer, Per Share Amount, Cash Tender Offer, Per Share Amount, Cash Total liabilities and shareholders’ equity Liabilities and Equity Loss Contingencies [Line Items] Loss Contingencies [Line Items] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Income Taxes Income Tax Disclosure [Text Block] Tax provision (benefit) effect on hedging activities Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Entity Address, City or Town Entity Address, City or Town Volume-weighted average sales price, ordinary shares, used to determine exchange ratio (in dollars per share) Volume-Weighted Average Sales Price, Ordinary Shares, Used To Determine Exchange Ratio Volume-Weighted Average Sales Price, Ordinary Shares, Used To Determine Exchange Ratio Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Acquisition of intangible assets Payments to Acquire Intangible Assets Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Operating lease cost Operating Lease, Cost Time deposits Time deposits Bank Time Deposits [Member] Income tax examination, tax, penalties and interest accrued Income Tax Examination, Penalties and Interest Accrued Hedging Relationship [Axis] Hedging Relationship [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Ordinary shares (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Proceeds from maturity of investments Proceeds from Sale, Maturity and Collection of Investments 2024 Notes Exchangeable Senior Notes Due 2024 [Member] Exchangeable Senior Notes Due 2024 [Member] Other non-cash transactions Other Noncash Income (Expense) Short-term lease cost Short-term Lease, Cost Exchange ratio, upper threshold Exchange Ratio, Upper Threshold Exchange Ratio, Upper Threshold 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] Capital Redemption Reserve Capital Redemption Reserve [Member] Capital Redemption Reserve [Member] Equity Component [Domain] Equity Component [Domain] Schedule of Gains (Losses) on Derivative Instruments Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Liabilities Liabilities [Abstract] Other non-current assets Increase (Decrease) in Other Noncurrent Assets Number of shares per GW American Depository Share (in shares) Number Of Shares Per GW American Depository Share Number Of Shares Per GW American Depository Share Property, plant and equipment, net Property, plant and equipment, net Property, Plant and Equipment, Net Construction-in-progress Construction in Progress [Member] 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Three Entity Tax Identification Number Entity Tax Identification Number Interest expense, net Interest Income (Expense), Nonoperating, Net Share-Based Compensation Share-based Payment Arrangement [Text Block] Interest rate contracts Interest Rate Contract [Member] Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] 2021 (remainder) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Carrying value of the equity component Debt Instrument, Convertible, Carrying Amount of Equity Component Pro Forma Pro Forma [Member] Inventories Inventory Disclosure [Text Block] Leases [Abstract] Leases [Abstract] Exchange ratio, lower threshold Exchange Ratio, Lower Threshold Exchange Ratio, Lower Threshold Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Price per share to be paid to former shareholders, cash (in dollars per share) Price Per Share To Be Paid To Former Shareholders, Cash Price Per Share To Be Paid To Former Shareholders, Cash Total current assets Assets, Current Current Fiscal Year End Date Current Fiscal Year End Date Operating expenses: Operating Expenses [Abstract] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Term Loan Term Loan [Member] Term Loan [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Manufacturing contracts Manufacturing Contracts [Member] Manufacturing Contracts [Member] Upfront Payments Upfront Payments [Member] Upfront Payments [Member] Shareholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Acquired developed technologies Developed Technology Rights [Member] Document Fiscal period Focus Document Fiscal Period Focus Offsetting Liabilities [Table] Offsetting Liabilities [Table] Deferred revenue, non-current Contract with Customer, Liability, Noncurrent Vyxeos Vyxeos [Member] Vyxeos [Member] Entity Filer Category Entity Filer Category Schedule of Share-Based Compensation Expense Related to Share Options, RSUs and Grants Under ESPP Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Ordinary Shares Common Stock [Member] Foreign Currency Translation Adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Product and Service [Domain] Product and Service [Domain] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] 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 Term Loan B Senior Secured Credit Facility Term Loan B Senior Secured Credit Facility [Member] Term Loan B Senior Secured Credit Facility Capital redemption reserve Capital Redemption Reserve Capital redemption reserve created under Irish company law to preserve permanent capital in the company. Convertible Debt Convertible Debt Convertible Debt [Member] Schedule of Property and Equipment Property, Plant and Equipment [Table Text Block] Exchange ratio, middle threshold, numerator Exchange Ratio, Middle Threshold, Numerator Exchange Ratio, Middle Threshold, Numerator Leasehold improvements Leasehold Improvements [Member] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Ordinary Options Ordinary Shares [Member] Ordinary Shares [Member] Interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Money market funds Money Market Funds [Member] Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 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 Net increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Acquisition Agreement Business Combination Disclosure [Text Block] Hedging Relationship [Domain] Hedging Relationship [Domain] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Schedule of Operating Lease Liability Maturities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Employee Stock Option Share-based Payment Arrangement, Option [Member] Weighted-average ordinary shares used in per share calculations - basic (in shares) Weighted-average ordinary shares used in per share calculation - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Available-for-sale securities: Debt Securities, Available-for-sale [Abstract] Subsequent Events [Abstract] Subsequent Events [Abstract] Ownership [Axis] Ownership [Axis] Liability Derivatives Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Variable Interest Entity Consolidation, Variable Interest Entity, Policy [Policy Text Block] Cash Flow Hedges Cash Flow Hedging [Member] Loss Contingencies [Table] Loss Contingencies [Table] Ownership [Domain] Ownership [Domain] Revenues Revenue from Contract with Customer [Text Block] Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] Denominator: Denominator [Abstract] Denominator [Abstract] Equity securities without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount November 2016 Share Repurchase Program November 2016 Share Repurchase Program [Member] November 2016 Share Repurchase Program [Member] Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 2022 Finite-Lived Intangible Asset, Expected Amortization, Year One Foreign exchange gain (loss) Foreign Currency Transaction Gain (Loss), before Tax Income tax provision (benefit) Income Tax Expense (Benefit) 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). 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 Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Accrued liabilities Total accrued liabilities Accrued Liabilities, Current Diluted (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Local Phone Number Local Phone Number Thereafter Long-Term Debt, Maturity, After Year Four Long-Term Debt, Maturity, After Year Four Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Tender offer, per share amount offered, stock (in dollars per share) Tender Offer, Per Share Amount, Stock Tender Offer, Per Share Amount, Stock Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Royalties and contract revenues Product And Services, Royalties And Contract Revenue [Member] Product And Services, Royalties And Contract Revenue [Member] Derivative [Line Items] Derivative [Line Items] Tender offer, payment to acquire business, gross Tender Offer, Payment To Acquire Business, Gross Tender Offer, Payment To Acquire Business, Gross Long term debt outstanding Total Long-term Debt, Gross Number of license, development and commercialization agreements Licensing Agreement, Number Of Agreements Licensing Agreement, Number Of Agreements Schedule of Long-term Debt Schedule of Long-term Debt Instruments [Table Text Block] Depreciation Depreciation Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Beginning balance Ending balance Contract with Customer, Liability Emerging Growth Company Entity Emerging Growth Company Issuance of ordinary shares in conjunction with exercise of share options Stock Issued During Period, Value, Stock Options Exercised Total share-based compensation expense, net of tax Share-based Payment Arrangement, Expense, after Tax Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Jazz Securities Designated Activity Company Jazz Securities Designated Activity Company [Member] Jazz Securities Designated Activity Company Deferred tax benefit Deferred Income Tax Expense (Benefit) Gross Amounts of Recognized Assets/ Liabilities Derivative Liability, Fair Value, Gross Liability McKesson McKesson Corporation [Member] McKesson Corporation [Member] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Award Type [Axis] Award Type [Axis] Net Amount Derivative Liability, Fair Value, Amount Offset Against Collateral Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Repayments of long-term debt Repayments of Secured Debt Maximum Maximum [Member] Derivative Financial Instruments Derivative, Collateral, Obligation to Return Securities Retained Earnings Retained Earnings [Member] Operating lease liabilities, less current portion Increase (Decrease) In Operating Lease Liabilities, Noncurrent Increase (Decrease) In Operating Lease Liabilities, Noncurrent Effective income tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Class action lawsuits filed Loss Contingency, New Claims Filed, Number 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] Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Acquisition of investments Payments to Acquire Investments Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Domain] Award Type [Domain] Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Trading Symbol Trading Symbol Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Proceeds from employee equity incentive and purchase plans Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Net Income (Loss) per Ordinary Share Earnings Per Share [Text Block] Cash Collateral Received (Pledged) Derivative, Collateral, Right to Reclaim Cash Derivative Financial Instruments Derivative, Collateral, Right to Reclaim Securities Current liabilities: Liabilities, Current [Abstract] Ireland statutory income tax rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Entity Shell Company Entity Shell Company Research and development Research and Development Expense (Excluding Acquired in Process Cost) Recurring Fair Value, Recurring [Member] Income Taxes [Table] Income Tax Contingency [Table] Adoption of New Accounting Standards and Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 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).