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This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 false 4 Research and development 2 us-gaap_ResearchAndDevelopmentExpense us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 121200000 121200000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. 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Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -Paragraph 5A true 7 Share-based compensation cost included in inventory 2 us-gaap_InventoryNet us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 108672000 108672000 false false false 2 false false false false 0 0 false false false 3 false true false false 108672000 108672000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). No authoritative reference available. false 23 Stock option transactions 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. false 24 Outstanding at December 31, 2009, Options 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber us-gaap true na instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 37450036 37450036 false false false 4 false false false false 0 0 false false false xbrli:sharesItemType shares The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) false 26 Exercised, Options 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriod us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -2400534 -2400534 false false false 4 false false false false 0 0 false false false xbrli:sharesItemType shares The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option plan. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(f) false 28 Expired, Options 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -985393 -985393 false false false 4 false false false false 0 0 false false false xbrli:sharesItemType shares The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(g) true 29 Outstanding at September 30, 2010, Options 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber us-gaap true na instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 39850804 39850804 false false false 2 false false false false 0 0 false false false 3 false true false false 39850804 39850804 false false false 4 false false false false 0 0 false false false xbrli:sharesItemType shares The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) false 30 Vested at September 30, 2010 or expected to vest in the future, Options 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 39155242 39155242 false false false 2 false false false false 0 0 false false false 3 false true false false 39155242 39155242 false false false 4 false false false false 0 0 false false false xbrli:sharesItemType shares As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) false 31 Vested at September 30, 2010, Options 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 20278274 20278274 false false false 2 false false false false 0 0 false false false 3 false true false false 20278274 20278274 false false false 4 false false false false 0 0 false false false xbrli:sharesItemType shares As of the balance sheet date, the number of shares for which fully vested and expected to vest stock options can be exercised under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(2) false 32 Outstanding at December 31, 2009, Weighted average exercise price per option 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap true na instant No definition available. false false false false false false false false true false false periodstartlabel true 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 true true false false 44.63 44.63 false false false 4 false false false false 0 0 false false false us-types:perShareItemType decimal The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) false 33 Granted, Weighted average exercise price per option 2 celg_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsGrantsInPeriodWeightedAverageExercisePrice celg false na duration Share Based Compensation Arrangement By Share Based Payments Award Options Grants In Period Weighted Average Exercise Price false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 56.79 56.79 false false false 4 false false false false 0 0 false false false xbrli:sharesItemType shares Share Based Compensation Arrangement By Share Based Payments Award Options Grants In Period Weighted Average Exercise Price No authoritative reference available. false 34 Exercised, Weighted average exercise price per option 2 celg_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsExercisesInPeriodWeightedAverageExercisePrice celg false na duration Share Based Compensation Arrangement By Share Based Payments Award Options Exercises In Period Weighted Average Exercise... false false false false false false false false false false false verboselabel true 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 true true false false 26.48 26.48 false false false 4 false false false false 0 0 false false false xbrli:decimalItemType decimal Share Based Compensation Arrangement By Share Based Payments Award Options Exercises In Period Weighted Average Exercise Price. No authoritative reference available. false 35 Forfeited, Weighted average exercise price per option 2 celg_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice celg false na duration Based Payments Award Options Forfeitures In Period Weighted Average Exercise Price. false false false false false false false false false false false verboselabel true 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 true true false false 56.09 56.09 false false false 4 false false false false 0 0 false false false xbrli:decimalItemType decimal Based Payments Award Options Forfeitures In Period Weighted Average Exercise Price. No authoritative reference available. false 36 Expired, Weighted average exercise price per option 2 celg_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice celg false na duration Share Based Compensation Arrangement By Share Based Payments Award Options Expirations In Period Weighted Average Exercise... false false false false false false false false false false false verboselabel true 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 true true false false 48.12 48.12 false false false 4 false false false false 0 0 false false false xbrli:decimalItemType decimal Share Based Compensation Arrangement By Share Based Payments Award Options Expirations In Period Weighted Average Exercise Price. No authoritative reference available. false 37 Outstanding at September 30, 2010, Weighted average exercise price per option 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap true na instant No definition available. false false false false false false false false false true false periodendlabel true 1 true true false false 47.42 47.42 false false false 2 false false false false 0 0 false false false 3 true true false false 47.42 47.42 false false false 4 false false false false 0 0 false false false us-types:perShareItemType decimal The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) false 38 Vested at September 30, 2010 or expected to vest in the future Weighted Average Exercise Price Per Option 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel true 1 true true false false 47.29 47.29 false false false 2 false false false false 0 0 false false false 3 true true false false 47.29 47.29 false false false 4 false false false false 0 0 false false false us-types:perShareItemType decimal As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) false 39 Vested at September 30, 2010, Weighted Average Exercise Price Per Option 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel true 1 true true false false 39.4 39.4 false false false 2 false false false false 0 0 false false false 3 true true false false 39.4 39.4 false false false 4 false false false false 0 0 false false false us-types:perShareItemType decimal As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(2) false 40 Outstanding at December 31, 2009, Weighted Average Remaining Contractual Term (Years) 2 celg_OutstandingWeightedAverageRemainingContractualTerm celg false na instant Outstanding Weighted Average Remaining Contractual Term. false false false false false false false false true false false periodstartlabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 7 7 false false false 4 false false false false 0 0 false false false xbrli:decimalItemType decimal Outstanding Weighted Average Remaining Contractual Term. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) false 45 Outstanding at September 30, 2010, Aggregate Intrinsic Value 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 489321000 489321000 false false false 2 false false false false 0 0 false false false 3 false true false false 489321000 489321000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance-sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) false 46 Vested at September 30, 2010 or expected to vest in the future Aggregate Intrinsic Value 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 486364000 486364000 false false false 2 false false false false 0 0 false false false 3 false true false false 486364000 486364000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) false 47 Vested at September 30, 2010, Aggregate Intrinsic Value 2 celg_VestedAggregateIntrinsicValue celg false debit instant Vested Aggregate Intrinsic Value. false false false false false false false false false false false verboselabel false 1 false true false false 406675000 406675000 false false false 2 false false false false 0 0 false false false 3 false true false false 406675000 406675000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Vested Aggregate Intrinsic Value. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) false 52 The first choice for the employees in calculating the number of RSUs to be granted 2 celg_FirstChoiceForEmployeesInCalculatingNumberOfRSUsToBeGranted celg false na duration The first choice for the employees in calculating the number of RSUs to be granted. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 100% stock options false false false 4 false false false false 0 0 false false false xbrli:stringItemType string The first choice for the employees in calculating the number of RSUs to be granted. No authoritative reference available. false 53 The second choice for the employees in calculating the number of RSUs to be granted 2 celg_SecondChoiceForEmployeesInCalculatingNumberOfRSUsToBeGranted celg false na duration The second choice for the employees in calculating the number of RSUs to be granted. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 A mix of stock options and RSUs based on a two-thirds and one-third mix, using a three-to-one ratio of stock options false false false 4 false false false false 0 0 false false false xbrli:stringItemType string The second choice for the employees in calculating the number of RSUs to be granted. 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No authoritative reference available. false 55 Share based compensation expense [Member] 0 na true na na No definition available. false true false false false false false false false false false http://celgene.com/role/sharebasedcompensationdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 6 USD true false false false celg_ShareBasedCompensationExpenseMember us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis xbrldi http://xbrl.org/2006/xbrldi celg_ShareBasedCompensationExpenseMember us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false celg_ShareBasedCompensationExpenseMember us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis xbrldi http://xbrl.org/2006/xbrldi celg_ShareBasedCompensationExpenseMember us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD true false false false celg_ShareBasedCompensationExpenseMember us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis xbrldi http://xbrl.org/2006/xbrldi celg_ShareBasedCompensationExpenseMember us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 9 USD true false false false celg_ShareBasedCompensationExpenseMember us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis xbrldi http://xbrl.org/2006/xbrldi celg_ShareBasedCompensationExpenseMember us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 10 USD true false false false celg_ShareBasedCompensationExpenseMember us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis xbrldi http://xbrl.org/2006/xbrldi celg_ShareBasedCompensationExpenseMember us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. 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This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 false 58 Research and development 2 us-gaap_ResearchAndDevelopmentExpense us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 21220000 21220000 false false false 2 false true false false 15178000 15178000 false false false 3 false true false false 60373000 60373000 false false false 4 false true false false 44841000 44841000 false false false xbrli:monetaryItemType monetary The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph g Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 2 -Paragraph 12, 13 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 86 -Paragraph 11, 12 false 59 Selling, general and administrative 2 us-gaap_SellingGeneralAndAdministrativeExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 24160000 24160000 false false false 2 false true false false 20167000 20167000 false false false 3 false true false false 66276000 66276000 false false false 4 false true false false 56384000 56384000 false false false xbrli:monetaryItemType monetary The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. 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Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). 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