Financial Instruments and Commodity Contracts - Summary of Notional Amount (Details) - Metal Contracts - kt kt in Thousands	Dec. 31, 2023	Mar. 31, 2023
Short
Derivative [Line Items]
Derivative, nonmonetary notional amount	996,000	842,000
Designated as Hedging Instrument | Cash Flow Hedges | Long
Derivative [Line Items]
Derivative, nonmonetary notional amount	0	1,000
Designated as Hedging Instrument | Cash Flow Hedges | Short
Derivative [Line Items]
Derivative, nonmonetary notional amount	754,000	699,000
Not Designated as Hedging Instrument | Short
Derivative [Line Items]
Derivative, nonmonetary notional amount	242,000	144,000