Commitments and Contingencies (Details) $ in Thousands				3 Months Ended	12 Months Ended
	May 31, 2024 USD ($)	Nov. 30, 2023 USD ($)	Oct. 27, 2023 USD ($)	May 31, 2024 USD ($) a	Feb. 29, 2024 USD ($)
Loss Contingencies [Line Items]
Loss contingency accrual	$ 5,250			$ 5,250
Amount awarded to other party		$ 5,500	$ 5,500
Loss contingency, receivable, current	5,200			$ 5,200
Litigation settlement, payment period (in days)				60 days
Appeal process duration (in years)			2 years
Environment liability	20,900			$ 20,900
Environmental liability, current	2,900			2,900
Capital commitments	$ 47,000			$ 47,000
Area of facility (in acres) | a				25
Percent of output under take-or-pay contract	0.75			0.75
Unrecorded purchase obligation	$ 124,000			$ 124,000
Purchase obligations				16,200	$ 60,800
Capital Commitments
Loss Contingencies [Line Items]
Long-term purchase commitment, amount				$ 28,600
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	$ 9,200