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Revenue Recognition - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue recognized included in contract liability balance at the beginning of the period |  |  | $ 9,900,000 | $ 7,900,000 |
Impairment losses recognized on contract costs |  |  | 0 | 0 |
Selling and marketing |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract costs included in selling and marketing expenses | $ 300,000 | $ 300,000 | 700,000 | $ 500,000 |
Other Current and Non-current Assets |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract costs | $ 2,400,000 |  | $ 2,400,000 |  | $ 2,300,000

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + 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; classified as current. + 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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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
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