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Contingencies, Significant Estimates and Concentrations - Schedule of Significant Portion of Revenues from the Department of Defense (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | [1] | Jun. 30, 2020 | [2] | Mar. 31, 2020 | [3] | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | [4] | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,784.2 | $ 1,580.8 | $ 1,796.7 | $ 1,695.1 | $ 2,195.7 | $ 2,392.7 | $ 1,990.2 | $ 1,803.4 | $ 6,856.8 | $ 8,382.0 | $ 7,705.5
DoD |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,300.4 | 2,006.9 | 1,648.4
Foreign Military |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 71.2 | 27.7 | 28.0
Total DoD Sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 2,371.6 | $ 2,034.6 | $ 1,676.4
[1] | The fourth quarter of fiscal 2020 was impacted by restructuring-related charges of $13.0 million ($9.5 million, net of tax) in the Access Equipment, Fire & Emergency and Commercial segments and Corporate, a gain of $4.2 million ($3.2 million, net of tax) for an arbitration settlement in the Defense segment, business interruption insurance proceeds of $18.5 million ($14.2 million, net of tax) in the Commercial segment and a gain on the sale of a business of $3.1 million ($2.8 million net of tax) in the Commercial segment.
[2] | The third quarter of fiscal 2020 was impacted by restructuring charges of $10.2 million ($8.4 million, net of tax) in the Access Equipment, Fire & Emergency and Commercial segments.
[3] | The second quarter of fiscal 2020 was impacted by debt extinguishment costs of $8.5 million ($6.5 million, net of tax) and a tax charge of $11.4 million related to the establishment of a valuation allowance on net operating losses for an entity in Europe.
[4] | The first quarter of fiscal 2019 was impacted by tax expense related to tax reform in the U.S. of $7.0 million.

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