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Stock compensation - Shares available for grant (Details)	9 Months Ended
	Sep. 30, 2019 shares
Shares Available For Grant
Outstanding at the beginning of the period (in shares)	7,023,328
Additional authorization (in shares)	7,700,000
Options, RSUs and PSUs granted (in shares)	(5,847,561)
Options, RSUs and PSUs cancelled (in shares)	825,589
Outstanding at the end of the period (in shares)	9,701,356

X

- Definition

Number of shares canceled under an established share-based compensation plan.

+ References

No definition available.

+ Details

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X

- Definition

Number of shares granted under an established share-based compensation plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	incy_
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X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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X

- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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X

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

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