Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	May 31, 2024	Aug. 31, 2023	May 31, 2023
Statement of Financial Position [Abstract]
Receivables, allowance	$ 5,082	$ 5,048	$ 5,113
Preferred stock, par value	$ 1	$ 1	$ 1
Preferred stock, authorized	2,000,000	2,000,000	2,000,000
Preferred stock, issued	0	0	0
Preferred stock, outstanding	0	0	0
Common stock, par value	$ 1	$ 1	$ 1
Common stock, authorized	25,000,000	25,000,000	25,000,000
Common stock, issued	19,123,000	19,094,000	19,092,000
Treasury stock, shares	8,237,000	8,083,000	8,083,000