Debentures (Details) $ / shares in Units, shares in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 31, 2024 USD ($) $ / shares	Aug. 31, 2023 USD ($)	Aug. 31, 2024 USD ($) $ / shares shares	Aug. 31, 2023 USD ($)	Feb. 29, 2024 USD ($)	Nov. 13, 2023 USD ($)
Debt Instrument [Line Items]
Redemption period, end date			Feb. 15, 2029
Par value of convertible debentures			$ 1,000
Interest expense, debt	$ 2,000,000	$ 2,000,000	3,000,000	$ 3,000,000
Long-term notes (note 5)	195,000,000		195,000,000		$ 194,000,000
Related Party Principal Amounts of 2020 Debenture Owned	330,000,000		330,000,000
2020 Debentures
Debt Instrument [Line Items]
Face amount of debt						$ 365,000,000
Redemption period, end date					Nov. 13, 2023
Senior Convertible Notes
Debt Instrument [Line Items]
Face amount of debt	200,000,000		200,000,000		$ 194,000,000
Amortization of Debt Issuance Costs			1,000,000
Long-Term Debt	$ 195,000,000		$ 195,000,000
Interest rate	3.00%		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		$ 3.88
Date of first interest payment			Aug. 15, 2024
Debt Instrument, Interest Rate Terms			The Notes 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