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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, 2020 | Sep. 30, 2019
Goodwill [Line Items] |  |
Goodwill resulting from acquisitions | $ 118,628 | $ 17,484
Value of intangible asset | 296,334 | 205,162
Core Technology [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | 161,280 | 84,518
Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | 124,905 | 111,242
TTS Wireless [Member] |  |
Goodwill [Line Items] |  |
Goodwill resulting from acquisitions |  | 8,218
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
Openet [Member] |  |
Goodwill [Line Items] |  |
Goodwill resulting from acquisitions | 102,898 |
Openet [Member] | Trademarks [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 2,594 |
Useful life of intangible assets | 2 years |
Openet [Member] | Core Technology [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 53,614 |
Useful life of intangible assets | 5 years |
Openet [Member] | Customer Relationships [Member] |  |
Goodwill [Line Items] |  |
Value of intangible asset | $ 40,409 |
Useful life of intangible assets | 8 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: 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=121556970&loc=d3e13816-109267 + Details
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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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