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	15,724				15,724
Other comprehensive income, net of tax	876						876
Dividends	(9,697)				(9,697)
Treasury stock purchases (in shares)								224
Restricted shares forfeited	(4,389)							$ (4,389)
Restricted shares forfeited (in shares)			(10)
Restricted shares forfeited	(199)		$ (199)
Share-based compensation expense (in shares)			387
Share-based compensation expense	2,507		$ 2,507
Balance (in shares) at Apr. 25, 2020			10,970	4,294				726
Balance at Apr. 25, 2020	327,008		$ 67,422	$ 697	280,294		(7,466)	$ (13,939)
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)
Net income	11,152				11,152
Other comprehensive income, net of tax	506						506
Dividends	(3,259)				(3,259)
Treasury stock purchases (in shares)								213
Restricted shares forfeited	(4,140)							$ (4,140)
Restricted shares forfeited (in shares)			(1)
Restricted shares forfeited	(19)		$ (19)
Share-based compensation expense (in shares)			385
Share-based compensation expense	786		$ 786
Balance (in shares) at Apr. 25, 2020			10,970	4,294				726
Balance at Apr. 25, 2020	327,008		$ 67,422	$ 697	280,294		(7,466)	$ (13,939)
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	10,490				10,490
Other comprehensive income, net of tax	2,351						2,351
Dividends	(9,785)				(9,785)
Restricted shares forfeited (in shares)			(8)
Restricted shares forfeited	(24)		$ (24)
Share-based compensation expense (in shares)			8
Share-based compensation expense	1,916		$ 1,916
Balance (in shares) at Apr. 24, 2021			10,985	4,294				726
Balance at Apr. 24, 2021	337,268		$ 69,964	$ 697	286,946		(6,400)	$ (13,939)
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)
Net income	2,574				2,574
Other comprehensive income, net of tax	1,054						1,054
Dividends	(3,262)				(3,262)
Share-based compensation expense	640		$ 640
Balance (in shares) at Apr. 24, 2021			10,985	4,294				726
Balance at Apr. 24, 2021	$ 337,268		$ 69,964	$ 697	$ 286,946		$ (6,400)	$ (13,939)