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Collaboration Agreements (StemSynergy Collaboration, Narrative) (Details) - Collaborative Arrangement With StemSynergy - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2018	Jan. 01, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront and milestone payments	$ 3.0
First Product To Reach Market
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement		$ 56.5

X

- Definition

Eligible Payment From Collaboration For Development And Regulatory Milestone Achievement Under Collaborations Agreement

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No definition available.

+ Details

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Namespace Prefix:	exel_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Upfront and milestone payments.

+ References

No definition available.

+ Details

Name:	exel_UpfrontAndMilestonePayments
Namespace Prefix:	exel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=exel_CollaborativeArrangementWithStemSynergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	exel_MilestoneObjectiveAxis=exel_FirstProductToReachMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: