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Goodwill and Intangible Assets, Net - Details of Total Goodwill (Parenthetical) (Detail) - USD ($)
$ in Thousands

12 Months Ended

Sep. 30, 2021

Sep. 30, 2020

Goodwill [Line Items]

Goodwill resulting from acquisitions

$ 104,151

^[1]

$ 118,628

^[2]

Value of intangible asset

259,032

296,334

Core Technology [Member]

Goodwill [Line Items]

Value of intangible asset

118,730

161,280

Customer Relationships [Member]

Goodwill [Line Items]

Value of intangible asset

133,038

124,905

Openet [Member]

Goodwill [Line Items]

Goodwill resulting from acquisitions

110,347

Openet [Member] | Trademark [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

Sourced [Member]

Goodwill [Line Items]

Goodwill resulting from acquisitions

80,055

Sourced [Member] | Core Technology [Member]

Goodwill [Line Items]

Value of intangible asset

$ 3,056

Useful life of intangible assets

3 years

Sourced [Member] | Customer Relationships [Member]

Goodwill [Line Items]

Value of intangible asset

$ 18,211

Useful life of intangible assets

7 years

[1]	Mainly relates to the acquisition of Sourced. In allocating the total preliminary purchase price for Sourced, based on estimated fair values, the Company recorded $80,055 of goodwill, $18,211 of customer relationships to be amortized over approximately seven years and $3,056 of core technology to be amortized over three years.
[2]	Mainly relates to the acquisition of Openet. In allocating the total purchase price for Openet, based on estimated fair values, the Company recorded $110,347 of goodwill, $40,409 of customer relationships to be amortized over approximately eight years, $53,614 of core technology to be amortized over five years and $2,594 of trademark to be amortized over two years.

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+ 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

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+ 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
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-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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