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Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Fire & Emergency |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Interest Expense, Customer Deposits | $ 15.6 | $ 14.5 | $ 18.1
Customer Concentration Risk | Sales Revenue, Net | Defense | DoD |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Concentration Risk, Percentage | 98.00% | 97.00% | 90.00%

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