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FINANCIAL INSTRUMENTS AND RISK (Narrative) (Details)	9 Months Ended
	Jun. 30, 2021 USD ($)
Working Capital	$ 199,949,211
10% Change in Foreign Exchange Rate [Member]
Foreign currency risk, fluctuation in the net income (loss) reported due to change in exchange rate	$ 28,741

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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Balance Type:	credit
Period Type:	duration

X

- Definition

Represents amount of working capital.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: