CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member] Common Class A	Common Stock [Member] Common Class B	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Balance (in shares) at Jul. 27, 2019			10,593	4,294				502
Balance at Jul. 27, 2019	$ 318,672	$ 3,514	$ 65,114	$ 697	$ 270,753	$ 3,514	$ (8,342)	$ (9,550)
Net income	4,572				4,572
Other comprehensive income, net of tax	370						370
Dividends	(6,438)				(6,438)
Treasury stock purchases (in shares)								11
Restricted shares forfeited	(249)							$ (249)
Restricted shares forfeited (in shares)			(9)
Restricted shares forfeited	(180)		$ (180)
Share-based compensation expense (in shares)			2
Share-based compensation expense	1,721		$ 1,721
Balance (in shares) at Jan. 25, 2020			10,586	4,294				513
Balance at Jan. 25, 2020	321,982		$ 66,655	$ 697	272,401		(7,972)	$ (9,799)
Balance (in shares) at Oct. 26, 2019			10,593	4,294				503
Balance at Oct. 26, 2019	322,447		$ 65,947	$ 697	273,614		(8,241)	$ (9,570)
Net income	2,005				2,005
Other comprehensive income, net of tax	269						269
Dividends	(3,218)				(3,218)
Treasury stock purchases (in shares)								10
Restricted shares forfeited	(229)							$ (229)
Restricted shares forfeited (in shares)			(7)
Restricted shares forfeited	(150)		$ (150)
Share-based compensation expense (in shares)			0
Share-based compensation expense	858		$ 858
Balance (in shares) at Jan. 25, 2020			10,586	4,294				513
Balance at Jan. 25, 2020	321,982		$ 66,655	$ 697	272,401		(7,972)	$ (9,799)
Balance (in shares) at Jul. 25, 2020			10,985	4,294				726
Balance at Jul. 25, 2020	332,320		$ 68,072	$ 697	286,241		(8,751)	$ (13,939)
Net income	7,916				7,916
Other comprehensive income, net of tax	1,297						1,297
Dividends	(6,523)				(6,523)
Restricted shares forfeited (in shares)			(8)
Restricted shares forfeited	(24)		$ (24)
Share-based compensation expense (in shares)			8
Share-based compensation expense	1,276		$ 1,276
Balance (in shares) at Jan. 23, 2021			10,985	4,294				726
Balance at Jan. 23, 2021	336,262		$ 69,324	$ 697	287,634		(7,454)	$ (13,939)
Balance (in shares) at Oct. 24, 2020			10,988	4,294				726
Balance at Oct. 24, 2020	333,741		$ 68,695	$ 697	286,344		(8,056)	$ (13,939)
Net income	4,555				4,555
Other comprehensive income, net of tax	602						602
Dividends	(3,265)				(3,265)
Restricted shares forfeited (in shares)			(3)
Restricted shares forfeited	(12)		$ (12)
Share-based compensation expense (in shares)			0
Share-based compensation expense	641		$ 641
Balance (in shares) at Jan. 23, 2021			10,985	4,294				726
Balance at Jan. 23, 2021	$ 336,262		$ 69,324	$ 697	$ 287,634		$ (7,454)	$ (13,939)