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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

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