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Balance Sheet Details - Other Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
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Balance Sheet Details [Abstract] |  |
Intangible assets | $ 237,528 | $ 237,178
Unbilled receivables | 171,787 | 158,885
Capitalized contract acquisition costs | 44,245 | 43,571
Other | 36,948 | 32,924
Other Assets, Noncurrent | $ 490,508 | $ 472,558

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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; classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + Details
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