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Goodwill and Intangible Assets, Net - Details of Total Goodwill (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Goodwill [Line Items] |  |
Goodwill resulting from acquisitions | $ 17,484 | $ 227,283
Value of intangible asset | 205,162 | 265,249
Core Technology [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | 84,518 | 144,448
Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | 111,242 | 110,519
TTS Wireless [Member] |  |
Goodwill [Line Items] |  |
Goodwill resulting from acquisitions | 10,032 |
TTS Wireless [Member] | Trademarks [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 1,300 |
Useful life of intangible assets | 4 years |
TTS Wireless [Member] | Core Technology [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 2,100 |
Useful life of intangible assets | 6 years |
TTS Wireless [Member] | Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 29,500 |
Useful life of intangible assets | 6 years |
Vubiquity [Member] |  |
Goodwill [Line Items] |  |
Goodwill resulting from acquisitions |  | 148,184
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 |  | $ 34,390
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 |  | $ 40,629
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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