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Derivatives - Schedule of Commodity Swap Contracts Outstanding (Details) - Cash Flow Hedge
$ in Millions
6 Months Ended 12 Months Ended
Apr. 04, 2021
USD ($)
t
Sep. 30, 2020
USD ($)
t
Brass swap contracts    
Derivative [Line Items]    
Notional | t 718.7 949.0
Contract Value | $ $ 4.0 $ 4.4
Zinc swap contracts    
Derivative [Line Items]    
Notional | t 2,883.0 1,552.0
Contract Value | $ $ 7.7 $ 3.4