Debentures (Details) $ / shares in Units, shares in Thousands	12 Months Ended
	Feb. 28, 2025 USD ($) $ / shares shares	Feb. 29, 2024 USD ($)	Feb. 28, 2023 USD ($)	Nov. 17, 2023 USD ($)	Nov. 13, 2023 USD ($)
Debt Instrument [Line Items]
Long-term notes (note 7)	$ 195,300,000	$ 194,100,000
Redemption period, end date	Feb. 15, 2029
Par value of convertible debentures	$ 1,000
Conversion of stock (in shares) | shares	51,500
Interest expense, debt	$ 6,000,000	5,600,000	$ 6,400,000
Long-term notes (note 7)	289,500,000	204,000,000
Repayments of Debt	0	515,000,000.0	$ 0
Related Party Principal Amounts of 2020 Debenture Owned	330,000,000
Senior Notes
Debt Instrument [Line Items]
Face amount of debt	200,000,000	194,100,000
Payments of Debt Issuance Costs	1,200,000
Long-term notes (note 7)	$ 195,300,000
Interest rate	3.00%
Debt Instrument, Convertible, Number of Equity Instruments - with decimals	257.5826
Conversion of stock (in shares) | shares	52,000
Conversion price (in dollars per share) | $ / shares	$ 3.88
Periodic payment, interest	$ 3,000,000.0
Debt Instrument, Frequency of Periodic Payment	semi-annual
Date of first interest payment	Aug. 15, 2024
Debt Instrument, Redemption, Description
Debt Instrument, Interest Rate Terms	The Notes will bear interest at a rate of 3.00% per annum, payable semi-annually in arrears on February 15 and August 15 of each year, beginning on August 15, 2024.
Payments of Debt Issuance Costs		$ 6,000,000
Extension Debentures
Debt Instrument [Line Items]
Face amount of debt				$ 150,000,000
Redemption period, end date		Feb. 15, 2024
2020 Debentures
Debt Instrument [Line Items]
Face amount of debt					$ 365,000,000
Redemption period, end date		Nov. 13, 2023