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Commitments and Contingencies (Details) $ in Millions | Oct. 31, 2019 USD ($)
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Wilmington Friends School Inc | Property purchase |
Property | $ 50.0

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_CounterpartyNameAxis=incy_WilmingtonFriendsSchoolIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=incy_PropertyPurchaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |