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Net Income Per Share - Narrative (Details) - 2014 Warrants	9 Months Ended
	Sep. 28, 2018 shares
Class of Warrant or Right [Line Items]
Term of warrants	2 years
Warrant outstanding (in shares)	1,000,000

X

- Definition

Class of Warrant or Right, Period

+ References

No definition available.

+ Details

Name:	exel_ClassofWarrantorRightPeriod
Namespace Prefix:	exel_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=exel_WarrantsIssuedOnJanuaryTwentySecondTwoThousandAndFourteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: