Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Aug. 31, 2026	Aug. 31, 2025	Aug. 31, 2024
Earnings Per Share [Abstract]
Net earnings (loss)	$ 89,700	$ 92,700	$ 85,700
Weighted average common shares outstanding for basic earnings per share	51,800,000	54,000,000.0	54,300,000
Net effect of dilutive securities-employee stock compensation plans	400,000	500,000	600,000
Weighted average common and equivalent shares outstanding for diluted earnings per share	52,200,000	54,500,000	54,900,000
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.73	$ 1.72	$ 1.51
Income (Loss) from Continuing Operations, Per Diluted Share	1.72	1.70	1.50
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0	0	0.07
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0	0	0.06
Loss per share - Basic (in dollars per share)	1.73	1.72	1.58
Diluted Earnings Per Share (in dollars per share):	$ 1.72	$ 1.70	$ 1.56
Anti-dilutive securities-equity based compensation plans (excluded from earnings per share calculation)	100,000	100,000	100,000
Net Earnings (Loss) from Continuing Operations	$ 89,700	$ 92,700	$ 82,200
Net (Loss) Earnings from Discontinued Operations	$ 0	$ 0	$ 3,500
Shares authorized in buyback program	200,000,000