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Nature of Business and Summary of Significant Accounting Policies - Estimated Useful Life of Definite-Lived Intangible Assets (Detail) | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 6 years | 8 years
Completed technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 5 years | 5 years
Completed technology | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 4 years |
Completed technology | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 10 years |
Customer contracts and relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 8 years | 12 years
Customer contracts and relationships | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 5 years |
Customer contracts and relationships | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 15 years |
Trade names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 3 years | 3 years
Trade names | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life |  |

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- 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
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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