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Commitments and contingencies - Narrative (Details) $ in Millions	Dec. 31, 2021 USD ($) disallowance
Loss Contingencies [Line Items]
Number of disallowances | disallowance	2
Settled Litigation
Loss Contingencies [Line Items]
Disallowance	$ 7.3
Pending Litigation
Loss Contingencies [Line Items]
Disallowance	$ 19.9

X

- Definition

Loss Contingency, Disallowed Amount

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Loss Contingency, Number Of Disallowances

+ References

No definition available.

+ Details

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Namespace Prefix:	mms_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: