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Other Balance Sheet Components - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Receivables Purchase Agreement, maximum sales amount | $ 200.0 |  |
Transfer of financial assets, accounted for as sales | 334.3 | $ 450.4 |
Cash received from transfer of financial assets | 332.2 | 447.7 |
Depreciation expense | 19.2 | 28.4 | $ 28.3
Capitalized software amortization expense | 14.8 | 26.3 | 14.1
Amortization of deferred contract costs | 9.8 | $ 12.7 | $ 8.9
Australia, Dollars | Foreign currency translation adjustment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Shareholders' equity | 18.2 |  |
United Kingdom, Pounds | Foreign currency translation adjustment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Shareholders' equity | $ 13.3 |  |

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