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v3.22.2

LEASES (Details) | Mar. 31, 2022
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Disclosure of leases [text block] [Abstract] |
Estimated incremental borrowing rate | 5.00%

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

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- Definition Estimated incremental borrowing rate. + References No definition available. + Details
Name: | svm_EstimatedIncrementalBorrowingRateAppliedToLeaseReceivablesAndLeaseLiabilities
Namespace Prefix: | svm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant