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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details)	12 Months Ended
	Mar. 31, 2022 USD ($)
Disclosure of analysis of other comprehensive income by item [text block] [Abstract]
Currency translation adjustment net of tax

X

- Definition

It represent currency translation adjustment net of tax.

+ References

No definition available.

+ Details

Name:	svm_CurrencyTranslationAdjustmenNetOfTax
Namespace Prefix:	svm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	svm_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTextBlockAbstract
Namespace Prefix:	svm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration