Other Items - Narrative (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2023 |
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| Receivables [Abstract] | |||
| Receivables Purchase Agreement, maximum sales amount | $ 250.0 | ||
| Transfer of financial assets, accounted for as sales | 732.1 | $ 334.3 | $ 450.4 |
| Cash received from transfer of financial assets | 727.7 | 332.2 | 447.7 |
| Depreciation expense | 19.5 | 19.2 | 28.4 |
| Capitalized software amortization expense | 22.2 | 14.8 | 26.3 |
| Amortization of deferred contract costs | $ 12.1 | $ 9.8 | $ 12.7 |
| X | ||||||||||
- Definition Transfer of Financing Assets, Maximum Amount Authorized for Sale No definition available.
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- Definition Amount of expense for amortization of capitalized computer software costs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of derecognized financial assets from transactions which comprise an initial transfer and an agreement entered into in contemplation of the initial transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction, at the date of derecognition. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, before counterparty netting, of cash proceeds received in transfers of derecognized financial assets from transactions which comprise an initial transfer and an agreement entered into in contemplation of the initial transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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