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Other Balance Sheet Components - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Receivables Purchase Agreement, maximum sales amount |  | $ 200,000 |  |
Transfer of financial assets, accounted for as sales |  | 450,400 | $ 74,200 |
Cash received from transfer of financial assets |  | 447,700 | 73,900 |
Depreciation expense |  | 28,400 | 28,300 | $ 34,100
Gain on sale of land and building |  | 0 | 11,046 | 0
Capitalized software amortization expense |  | 26,300 | 14,100 | 12,300
Amortization of deferred contract costs |  | $ 12,700 | $ 8,900 | $ 13,600
Land and Building |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gain on sale of land and building | $ 11,000 |  |  |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-3 + Details
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