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Revenue Recognition - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019
Disaggregation Of Revenue [Line Items] |  |  |
Contract with Customer, Liability | $ 534.4 |  | $ 512.5
Customer advances | 407.2 |  | 382.0
Contract with customer other current liability | 75.3 |  | 78.2
Contract with Customer, Liability, Noncurrent | 51.9 |  | $ 52.3
Contract with Customer, Liability, Revenue Recognized | 172.9 | $ 236.0 |
Defense |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Increase (decrease) in net sales due to margin rate adjustments | 7.6 | 31.6 |
Increase (decrease) in operating income due to margin rate adjustments | 3.8 | 30.3 |
Increase (decrease) in net income due to margin rate adjustments | $ 3.0 | $ 23.2 |
Increase (decrease) in earnings per share due to margin rate adjustments (in dollars per share) | $ 0.04 | $ 0.32 |
Fire and Emergency |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Interest Expense, Customer Deposits | $ 3.2 | $ 3.6 |

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