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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | $ 7,737.3 | $ 6,856.8 |  | $ 8,382.0 |
Intersegment Eliminations |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | (24.6) | (34.6) | [1],[2] | (28.1) | [1]
Transferred at Point in Time |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 4,764.0 | 4,078.1 |  | 5,801.1 |
Transferred at Point in Time | Intersegment Eliminations |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | (25.1) | (36.0) | [2] | (30.1) |
Transferred over Time |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 2,973.3 | 2,778.7 |  | 2,580.9 |
Transferred over Time | Intersegment Eliminations |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 0.5 | 1.4 | [2] | 2.0 |
Access Equipment |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 3,067.3 | 2,505.7 |  | 4,079.7 |
Access Equipment | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 3,072.1 | 2,515.1 |  | 4,079.7 |
Access Equipment | Intersegment Eliminations |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 4.8 | 9.4 |  |  |
Access Equipment | Transferred at Point in Time | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 3,006.9 | 2,437.5 |  | 4,001.6 |
Access Equipment | Transferred over Time | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 65.2 | 77.6 |  | 78.1 |
Defense |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales | [1] | 2,524.1 | 2,300.4 |  | 2,085.7 |
Defense | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales | [1] | 2,525.6 | 2,311.5 | [2] | 2,097.5 | [2]
Defense | Intersegment Eliminations |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales | [1] | 1.5 | 11.1 |  | 11.8 |
Defense | Transferred at Point in Time | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 43.5 | 34.8 | [2] | 45.4 | [2]
Defense | Transferred over Time | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 2,482.1 | 2,276.7 | [2] | 2,052.1 | [2]
Fire & Emergency |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales | [1] | 1,211.6 | 1,098.0 |  | 1,194.4 |
Fire & Emergency | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales | [1] | 1,226.6 | 1,107.0 | [2] | 1,210.7 | [2]
Fire & Emergency | Intersegment Eliminations |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales | [1] | 15.0 | 9.0 |  | 16.3 |
Fire & Emergency | Transferred at Point in Time | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 1,205.9 | 1,085.1 | [2] | 1,192.5 | [2]
Fire & Emergency | Transferred over Time | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 20.7 | 21.9 | [2] | 18.2 | [2]
Commercial |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 933.6 | 951.3 |  | 1,020.1 |
Commercial | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 937.6 | 957.8 |  | 1,022.2 |
Commercial | Intersegment Eliminations |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 4.0 | 6.5 |  | 2.1 |
Commercial | Transferred at Point in Time | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | 532.8 | 556.7 |  | 591.7 |
Commercial | Transferred over Time | Operating Segments |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Net sales |  | $ 404.8 | $ 401.1 |  | $ 430.5 |
[1] | Results for fiscal 2020 and fiscal 2019 have been reclassified to reflect the move of the airport snow removal vehicle business from the Fire & Emergency segment to the Defense segment.
[2] | Results have been reclassified to reflect the move of the airport snow removal vehicle business from the Fire & Emergency segment to the Defense segment.

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