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Revenue from Contracts with Customers - Capitalized Contract Acquisition Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Capitalized Contract Acquisition Costs [Abstract] |  |  |
Balance, beginning of year | $ 77,220 | $ 77,836 | $ 70,396
Additional capitalized contract acquisition costs | 26,960 | 37,897 | 41,719
Amortization of capitalized contract acquisition costs | (37,712) | (38,513) | (34,279)
Balance, end of year | $ 66,468 | $ 77,220 | $ 77,836

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- Definition Capitalized Contract Acquisition Costs [Abstract] + References No definition available. + Details
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- Definition Capitalized Contract Cost, Deferred Acquisition Costs + References No definition available. + Details
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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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