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Goodwill and Intangible Assets, Net - Details of Total Goodwill (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Goodwill [Line Items] |  |
Goodwill resulting from acquisitions | $ 227,283 | $ 18,535
Value of intangible asset | 265,249 | 177,326
Core Technology [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | 144,448 | 91,172
Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | 110,519 | $ 82,642
Vubiquity [Member] |  |
Goodwill [Line Items] |  |
Goodwill resulting from acquisitions | 146,912 |
Vubiquity [Member] | Trademarks [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 10,104 |
Useful life of intangible assets | 8 years |
Vubiquity [Member] | Core Technology [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 45,692 |
Useful life of intangible assets | 5 years |
Vubiquity [Member] | Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 38,630 |
Useful life of intangible assets | 9 years |
Projekt 202 [Member] |  |
Goodwill [Line Items] |  |
Goodwill resulting from acquisitions | $ 34,032 |
Projekt 202 [Member] | Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 19,835 |
Useful life of intangible assets | 4 years |
UXP Systems [Member] |  |
Goodwill [Line Items] |  |
Goodwill resulting from acquisitions | $ 41,468 |
UXP Systems [Member] | Core Technology [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 31,552 |
Useful life of intangible assets | 5 years |
UXP Systems [Member] | Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 6,552 |
Useful life of intangible assets | 5 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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