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Contingencies, Significant Estimates and Concentrations - Schedule of Significant Portion of Revenues from the Department of Defense (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
DoD
Disaggregation Of Revenue [Line Items]
Net sales	2,395.1	2,300.4	2,006.9
Foreign Military
Disaggregation Of Revenue [Line Items]
Net sales	139.2	71.2	27.7
Total DoD Sales
Disaggregation Of Revenue [Line Items]
Net sales	$ 2,534.3	$ 2,371.6	$ 2,034.6

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