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SHORT-TERM INVESTMENTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Disclosure Of Short Term Investments Explanatory [Abstract] |  |
Impairment charges | $ 10.6 | $ 1.4
Bond investments | $ 1.8 | $ 0.1

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- Definition It represent bond investments. + References No definition available. + Details
Name: | svm_BondInvestments
Namespace Prefix: | svm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | svm_DisclosureOfShortTermInvestmentsExplanatoryAbstract
Namespace Prefix: | svm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition It represent impairment charges. + References No definition available. + Details
Name: | svm_ImpairmentCharges
Namespace Prefix: | svm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration