CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Stock Held in Trust	Deferred Compensation Liability	Treasury Stock, Common
Shares, Issued at Aug. 31, 2023		83,800
Beginning Balance at Aug. 31, 2023	$ 326,600	$ 16,700	$ 220,500	$ 1,011,100	$ (121,200)	$ (3,500)	$ 3,500	$ (800,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	85,700			85,700
Total other comprehensive income (loss), net of tax	4,800				4,800
Company stock contribution to employee benefit plans and other	200		200
Restricted stock awards, vesting and withhold to cover (in shares)		200
Restricted stock awards issuance and vesting	0
Cash dividend ($0.04 per share)	(2,100)			(2,100)
Treasury stock repurchases	(38,300)							38,300
Stock based compensation expense	10,900		10,900
Stock option exercises (in shares)		300
Stock Issued During Period, Value, Stock Options Exercised	6,900	$ 100	6,800
Stock issued to, acquired for and distributed from rabbi trust	(400)		(400)			(300)	300
Shares, Issued at Aug. 31, 2024		54,200
Ending Balance at Aug. 31, 2024	392,000	$ 10,800	235,700	261,900	(116,400)	(3,800)	3,800	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Other	3,100		3,100
Treasury Stock, Shares, Retired		(30,100)
Treasury Stock, Retired, Par Value Method, Amount		$ (6,000)
Treasury Stock, Retired, Cost Method, Amount	0			832,800				(838,800)
Net earnings (loss)	92,700			92,700
Total other comprehensive income (loss), net of tax	12,300				12,300
Company stock contribution to employee benefit plans and other	600		600
Restricted stock awards, vesting and withhold to cover (in shares)		300
Restricted stock awards issuance and vesting	0	$ 100	(100)
Cash dividend ($0.04 per share)	(2,100)			(2,100)
Treasury stock repurchases	(68,700)
Stock based compensation expense	13,000		13,000
Stock option exercises (in shares)		100
Stock Issued During Period, Value, Stock Options Exercised	1,700		1,700
Stock issued to, acquired for and distributed from rabbi trust	100		(100)			300	(300)
Shares, Issued at Aug. 31, 2025		52,900
Ending Balance at Aug. 31, 2025	433,700	$ 10,600	243,100	284,100	(104,100)	(3,500)	3,500	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Other	7,900		7,900
Treasury Stock, Shares, Retired		(1,700)
Treasury Stock, Retired, Par Value Method, Amount		$ (300)
Treasury Stock, Retired, Cost Method, Amount				68,400
Retained earnings	284,100
Net earnings (loss)	89,700			89,700
Total other comprehensive income (loss), net of tax	4,000				4,000
Company stock contribution to employee benefit plans and other	600		600
Restricted stock awards, vesting and withhold to cover (in shares)		200
Restricted stock awards issuance and vesting	0
Cash dividend ($0.04 per share)	(2,100)			(2,100)
Treasury stock repurchases	(81,100)
Stock based compensation expense	12,100		12,100
Stock option exercises (in shares)		100
Stock Issued During Period, Value, Stock Options Exercised	2,200		2,200
Stock issued to, acquired for and distributed from rabbi trust	0					(1,900)	1,900
Shares, Issued at Aug. 31, 2026		51,200
Ending Balance at Aug. 31, 2026	453,100	$ 10,200	252,000	291,000	$ (100,100)	$ (5,400)	$ 5,400	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Other	6,000		$ 6,000
Treasury Stock, Shares, Retired		(2,000)
Treasury Stock, Retired, Par Value Method, Amount		$ (400)
Treasury Stock, Retired, Cost Method, Amount				$ 80,700
Retained earnings	$ 291,000