Consolidated Statements of Stockholders Equity Statement - USD ($) $ in Thousands	Total	Common & Class B Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income
Total, Beginning of Period at Jul. 31, 2024	$ 210,588	$ 1,982	$ 60,031	$ 232,247	$ (84,441)	$ 769
Common & Class B Stock, Beginning of Period (in shares) at Jul. 31, 2024		19,825,170
Treasury Stock, Beginning of Period (in shares) at Jul. 31, 2024					(5,230,529)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	40,941	$ 0	0	40,941	$ 0	0
Other Comprehensive Income (Loss)	(18)	0	0	0	0	(18)
Dividends Declared	(6,299)	0	0	(6,299)	0	0
Purchases of Treasury Stock	(2,233)	0	0	0	$ (2,233)	0
Purchases of Treasury Stock (in shares)					(34,966)
Net issuance of stock under long-term incentive plans	0	$ 10	625	0	$ 635	0
Net issuance of stock under long-term incentive plans (in shares)		(94,575)			(12,422)
Amortization of Restricted Stock	3,880	$ 0	3,880	0	$ 0	0
Total, End of Period at Apr. 30, 2025	246,859	$ 1,992	64,536	266,889	$ (87,309)	751
Common Stock & Class B Stock, End of Period (in shares) at Apr. 30, 2025		19,919,745
Treasury Stock, End of Period (in shares) at Apr. 30, 2025					(5,277,917)
Total, Beginning of Period at Jan. 31, 2025	235,860	$ 1,987	63,195	257,349	$ (87,232)	561
Common & Class B Stock, Beginning of Period (in shares) at Jan. 31, 2025		19,866,445
Treasury Stock, Beginning of Period (in shares) at Jan. 31, 2025					(5,275,972)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	11,644	$ 0	0	11,644	$ 0	0
Other Comprehensive Income (Loss)	190	0	0	0	0	190
Dividends Declared	(2,104)	0	0	(2,104)	0	0
Purchases of Treasury Stock	(69)	0	0	0	$ (69)	0
Purchases of Treasury Stock (in shares)					(1,545)
Net issuance of stock under long-term incentive plans	0	$ 5	3	0	$ 8	0
Net issuance of stock under long-term incentive plans (in shares)		(53,300)			(400)
Amortization of Restricted Stock	1,338	$ 0	1,338	0	$ 0	0
Total, End of Period at Apr. 30, 2025	246,859	$ 1,992	64,536	266,889	$ (87,309)	751
Common Stock & Class B Stock, End of Period (in shares) at Apr. 30, 2025		19,919,745
Treasury Stock, End of Period (in shares) at Apr. 30, 2025					(5,277,917)
Total, Beginning of Period at Jul. 31, 2025	259,060	$ 1,993	66,138	277,500	$ (87,540)	969
Common & Class B Stock, Beginning of Period (in shares) at Jul. 31, 2025		19,926,745
Treasury Stock, Beginning of Period (in shares) at Jul. 31, 2025					(5,283,509)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	42,551	$ 0	0	42,551	$ 0	0
Other Comprehensive Income (Loss)	7	0	0	0	0	7
Dividends Declared	(7,932)	0	0	(7,932)	0	0
Purchases of Treasury Stock	(12,537)	0	0	0	$ (12,537)	0
Purchases of Treasury Stock (in shares)					(224,601)
Net issuance of stock under long-term incentive plans	0	$ 7	129	0	$ 136	0
Net issuance of stock under long-term incentive plans (in shares)		(73,400)			(3,700)
Amortization of Restricted Stock	4,077	$ 0	4,077	0	$ 0	0
Total, End of Period at Apr. 30, 2026	285,226	$ 2,000	70,344	312,119	$ (100,213)	976
Common Stock & Class B Stock, End of Period (in shares) at Apr. 30, 2026		20,000,145
Treasury Stock, End of Period (in shares) at Apr. 30, 2026					(5,511,810)
Total, Beginning of Period at Jan. 31, 2026	272,450	$ 1,999	68,980	300,343	$ (99,947)	1,075
Common & Class B Stock, Beginning of Period (in shares) at Jan. 31, 2026		19,989,245
Treasury Stock, Beginning of Period (in shares) at Jan. 31, 2026					(5,506,829)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	14,526	$ 0	0	14,526	$ 0	0
Other Comprehensive Income (Loss)	(99)	0	0	0	0	(99)
Dividends Declared	(2,750)	0	0	(2,750)	0	0
Purchases of Treasury Stock	(173)	0	0	0	$ (173)	0
Purchases of Treasury Stock (in shares)					(2,481)
Net issuance of stock under long-term incentive plans	0	$ 1	92	0	$ 93	0
Net issuance of stock under long-term incentive plans (in shares)		(10,900)			(2,500)
Amortization of Restricted Stock	1,272	$ 0	1,272	0	$ 0	0
Total, End of Period at Apr. 30, 2026	$ 285,226	$ 2,000	$ 70,344	$ 312,119	$ (100,213)	$ 976
Common Stock & Class B Stock, End of Period (in shares) at Apr. 30, 2026		20,000,145
Treasury Stock, End of Period (in shares) at Apr. 30, 2026					(5,511,810)