Name:	ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of amortization of deferral gain (loss) on warrants.

No definition available.

Name:	shmd_AmortizationOfDeferralGainLossOnWarrants
Namespace Prefix:	shmd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Carrying amount of deferred items relating to warrants, representing differences between fair value at initial recognition and transaction price that have not yet been recognized in profit or loss.

No definition available.

Name:	shmd_DeferralItemsOfWarrants
Namespace Prefix:	shmd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount deferred at the date of issuance of warrants, arising from the difference between the warrants' fair value at initial recognition and their transaction price, which is not recognized immediately in profit or loss but is amortized over the contractual term of the warrants.

No definition available.

Name:	shmd_DeferralItemsOfWarrantsInitialRecognition
Namespace Prefix:	shmd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

Name:	shmd_DeferralItemsOfWarrantsRollForwardAbstract
Namespace Prefix:	shmd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Transaction price attributable to warrants at initial recognition that is used in determining the Day1 deferred difference between the fair value of the warrants and the consideration allocated to them.

No definition available.