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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the length of time in which cost of goods sold will deviate from average due to unusual and/or infrequent conditions.

No definition available.

Name:	incy_PeriodOfDeviationFromAverageCostOfGoodsSold
Namespace Prefix:	incy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_InventoryLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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