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Litigation (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Feb. 29, 2020
--- | --- | ---
Commitments and Contingencies Disclosure [Abstract] |  |
Loss contingency, maximum potential loss | $ 31 |
Disallowance | $ 19 | $ 12

X
- Definition Loss Contingency, Disallowed Amount + References No definition available. + Details
Name: | mms_LossContingencyDisallowedAmount
Namespace Prefix: | mms_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loss Contingency, Maximum Potential Loss + References No definition available. + Details
Name: | mms_LossContingencyMaximumPotentialLoss
Namespace Prefix: | mms_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration