Commitments and Contingencies (Details) $ in Thousands			6 Months Ended	12 Months Ended
	May 31, 2024 USD ($)	Oct. 27, 2023 USD ($)	Aug. 31, 2024 USD ($) a	Feb. 29, 2024 USD ($)
Loss Contingencies [Line Items]
Amount awarded to other party		$ 5,500
Loss contingency, receivable, current			$ 5,200
Loss contingency accrual			5,250
Environment liability			20,400
Environmental liability, current			$ 2,800
Area of facility (in acres) | a			25
Percent of output under take-or-pay contract			0.75
Unrecorded purchase obligation			$ 124,000
Purchase obligations			35,600	$ 60,800
Capital commitments			27,600
Capital Commitments
Loss Contingencies [Line Items]
Long-term purchase commitment, amount			$ 17,400
Zinc Contract
Loss Contingencies [Line Items]
Long-term purchase commitment, amount	$ 37,900
Natural Gas Contract
Loss Contingencies [Line Items]
Long-term purchase commitment, amount	$ 9,300