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Balance Sheet Components Balance Sheet Components - Schedule of Deferred Contract Costs (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Balance Sheet Related Disclosures [Abstract] |  |
Deferred contract costs | $ 29,941 | $ 30,776
Less: Accumulated amortization | (15,561) | (14,478)
Total Deferred contract costs, net | $ 14,380 | $ 16,298

X
- Definition Accumulated amortization of deferred contract costs capitalized at the end of the reporting period. + References No definition available. + Details
Name: | mms_AccumulatedAmortizationOfDeferredContractCosts
Namespace Prefix: | mms_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred incremental direct costs incurred typically at a contract's inception so that the company may be in a position to fulfill all contractual obligations of an arrangement. The costs are directly related to specified activities under the arrangement and are deferred in order to match revenue. Excludes start-up costs (such as one-time activities related to opening a new facility, introducing a new product or service, establishing business with a new class of customers, preopening costs, and organization costs), which are expensed as incurred. + References No definition available. + Details
Name: | mms_DeferredContractCosts
Namespace Prefix: | mms_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Deferred incremental direct costs before deducting accumulated amortization, which are incurred typically at a contract's inception so that the company may be in a position to fulfill all contractual obligations of an arrangement. The costs are directly related to specified activities under the arrangement and are deferred in order to match revenue. Excludes start-up costs (such as one-time activities related to opening a new facility, introducing a new product or service, establishing business with a new class of customers, preopening costs and organization costs), which are expensed as incurred. + References No definition available. + Details
Name: | mms_DeferredContractCostsGross
Namespace Prefix: | mms_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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