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FINANCIAL INSTRUMENTS AND RISK (Narrative) (Details) - 6 months ended Mar. 31, 2023	USD ($)	CAD ($)	USD ($)
Working Capital			$ 155,967,246
Cash, CDIC insured amount		$ 100,000
Cash, FDIC insured amount			$ 250,000
10% Change in Foreign Exchange Rate [Member]
Foreign currency risk, fluctuation in the net income (loss) reported due to change in exchange rate	$ 1,988

X

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Canada Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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X

- Definition

Foreign currency risk, fluctuation in the net income (loss) reported due to change in exchange rate

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents amount of working capital.

+ References

No definition available.

+ Details

Name:	epix_WorkingCapital
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: