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Business Segment Information - Additional Information (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2021 USD ($) customer | Sep. 30, 2020 USD ($) customer | Sep. 30, 2019 USD ($) customer
Percentage Of Sale Of Customer Maximum | 10.00% | 10.00% | 10.00%
Capitalized Computer Software, Period Increase (Decrease) | $ 8.8 | $ 9.0 | $ 8.4
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] |  |  |
Number of customers who exceeded 10% of sales | customer | 0 | 1 | 0
Property, Plant and Equipment [Member] |  |  |
Depreciation | $ 21.2 | $ 19.5 | $ 16.5

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