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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
	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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