XML 64 R54.htm IDEA: XBRL DOCUMENT
v3.23.1

Commitments and Contingencies (Details) | Apr. 30, 2021 segment
--- | ---
Commitments and Contingencies Disclosure [Abstract] |
Number of lawsuits | 2

X
- Definition Loss Contingency, Number Of Lawsuits Consolidated + References No definition available. + Details
Name: | exel_LossContingencyNumberOfLawsuitsConsolidated
Namespace Prefix: | exel_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration