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Business Segment Information - Additional Information (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2024 USD ($) customer | Sep. 30, 2023 USD ($) customer | Sep. 30, 2022 USD ($) customer
Percentage Of Sale Of Customer Maximum | 10.00% | 10.00% | 10.00%
Capitalized Computer Software, Period Increase (Decrease) | $ 12.1 | $ 12.4 | $ 12.9
Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |
Number of customers who exceeded 10% of sales | customer | 0 | 0 | 0
Property, Plant and Equipment |  |  |
Depreciation | $ 22.6 | $ 21.6 | $ 22.4

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