The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 6 - Capital Shares - Options Outstanding and Exercisable (Details)	6 Months Ended
	Mar. 31, 2025 $ / shares shares	Mar. 31, 2025 $ / shares shares	Sep. 30, 2024 $ / shares shares	Mar. 31, 2024 $ / shares shares	Sep. 30, 2023 $ / shares shares
Options outstanding (in shares)	382,666	382,666	383,040	419,676	420,615
Options exercisable (in shares)	340,126	340,126
Options, exercise price (in CAD per Share) \| $ / shares	$ 24.66		$ 24.93	$ 25.47	$ 25.6
Range One [Member]
Options outstanding (in shares)	37,719	37,719
Options exercisable (in shares)	37,719	37,719
Options, exercise price (in CAD per Share) \| $ / shares		$ 15.12
Range Two [Member]
Options outstanding (in shares)	43,031	43,031
Options exercisable (in shares)	43,031	43,031
Options, exercise price (in CAD per Share) \| $ / shares	$ 22.12
Range Three [Member]
Options outstanding (in shares)	51,006	51,006
Options exercisable (in shares)	51,006	51,006
Options, exercise price, lower limit (in dollars per share) \| $ / shares	$ 52.08
Options, exercise price, upper limit (in dollars per share) \| $ / shares	$ 56.49
Range Four [Member]
Options outstanding (in shares)	81,041	81,041
Options exercisable (in shares)	81,041	81,041
Options, exercise price, lower limit (in dollars per share) \| $ / shares	$ 36.75
Options, exercise price, upper limit (in dollars per share) \| $ / shares	$ 40.18
Range Five [Member]
Options outstanding (in shares)	58,753	58,753
Options exercisable (in shares)	57,304	57,304
Options, exercise price (in CAD per Share) \| $ / shares	$ 25.97
Range Six [Member]
Options outstanding (in shares)	111,116	111,116
Options exercisable (in shares)	70,025	70,025
Options, exercise price, lower limit (in dollars per share) \| $ / shares	$ 4.1
Options, exercise price, upper limit (in dollars per share) \| $ / shares	$ 10.01