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Goodwill and Intangible Assets, Net - Details of Total Goodwill (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Goodwill [Line Items] |  |
Goodwill resulting from immaterial acquisitions | $ 18,535 | $ 164,506
Value of intangible asset | 177,326 | 281,527
Core Technology [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | 91,172 | 153,504
Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | 82,642 | $ 120,981
Vindicia [Member] | Core Technology [Member] |  |
Goodwill [Line Items] |  |
Goodwill resulting from immaterial acquisitions | 62,210 |
Value of intangible asset | $ 20,091 |
Useful life of intangible assets | 3 years |
Vindicia [Member] | Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 11,623 |
Useful life of intangible assets | 5 years |
Vindicia [Member] | Other [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 1,103 |
Useful life of intangible assets | 2 years |
Brite:Bill [Member] | Core Technology [Member] |  |
Goodwill [Line Items] |  |
Goodwill resulting from immaterial acquisitions | $ 45,037 |
Value of intangible asset | $ 20,917 |
Useful life of intangible assets | 3 years |
Brite:Bill [Member] | Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 9,638 |
Useful life of intangible assets | 7 years |
Brite:Bill [Member] | Other [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 773 |
Useful life of intangible assets | 2 years |
Pontis [Member] | Core Technology [Member] |  |
Goodwill [Line Items] |  |
Goodwill resulting from immaterial acquisitions | $ 40,457 |
Value of intangible asset | $ 24,361 |
Useful life of intangible assets | 4 years |
Pontis [Member] | Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 20,993 |
Useful life of intangible assets | 6 years |

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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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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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