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 [Member]	Common Stock [Member] Common Class B [Member]	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	2,567				2,567
Other comprehensive income, net of tax	101						101
Dividends	(3,220)				(3,220)
Treasury stock purchases (in shares)								1
Restricted shares forfeited	(20)							$ (20)
Restricted shares forfeited (in shares)			(2)
Restricted shares forfeited	(30)		$ (30)
Share-based compensation expense (in shares)			2
Share-based compensation expense	863		$ 863
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)
Tax expense (benefit) associated with other comprehensive loss and income	44
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	1,385
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	3,360				3,360
Other comprehensive income, net of tax	695						695
Dividends	(3,257)				(3,257)
Restricted shares forfeited (in shares)			(5)
Restricted shares forfeited	(12)		$ (12)
Share-based compensation expense (in shares)			8
Share-based compensation expense	635		$ 635
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)
Tax expense (benefit) associated with other comprehensive loss and income	$ 307