CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Treasury Stock
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,939				24,939
Other comprehensive income, net of tax	(409)				0		(409)
Dividends	(12,965)				(12,965)
Treasury stock purchases (in shares)								224
Treasury stock purchases	(4,389)							$ (4,389)
Restricted shares forfeited (in shares)			(20)
Restricted shares forfeited	(208)		$ (208)
Share-based compensation expense (in shares)			412
Share-based compensation expense	3,166		$ 3,166
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,994				19,994
Other comprehensive income, net of tax	(313)						(313)
Dividends	(13,050)				(13,050)
Restricted shares forfeited (in shares)			(15)
Restricted shares forfeited	(71)		$ (71)
Share-based compensation expense (in shares)			8
Share-based compensation expense	2,593		$ 2,593
Balance (in shares) at Jul. 31, 2021			10,978	4,294				726
Balance at Jul. 31, 2021	$ 341,473		$ 70,594	$ 697	$ 293,185		$ (9,064)	$ (13,939)