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v3.23.3

BASIS OF PRESENTATION (Schedule of Functional Currency of Company and its Subsidiaries) (Details) | 12 Months Ended
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Sep. 30, 2023
ESSA Pharmaceuticals Corp [Member] |
Basis of Presentation [Line Items] |
Effective interest | 100.00%

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- Definition Line items represent basis of presentation. + References No definition available. + Details
Name: | epix_BasisOfPresentationLineItems
Namespace Prefix: | epix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of effective interest in subsidiaries + References No definition available. + Details
Name: | epix_PercentageOfEffectiveInterestInSubsidiaries
Namespace Prefix: | epix_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_OwnershipAxis=epix_EssaPharmaceuticalsCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |