CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance (in shares) at Jul. 30, 2016		10,190	4,319			353
Balance at Jul. 30, 2016	$ 271,735	$ 55,196	$ 701	$ 234,175	$ (13,339)	$ (4,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,921			22,921
Other comprehensive income, net of tax	5,933				5,933
Dividends	$ (12,788)			(12,788)
Exercise of stock options (in shares)	(31)					(31)
Exercise of stock options	$ 812	$ 366				$ 446
Treasury stock purchases (in shares)						155
Treasury stock purchases	(4,081)					$ (4,081)
Restricted shares forfeited (in shares)		(5)
Restricted shares forfeited	(102)	$ (102)
Share-based compensation expense (in shares)		362
Share-based compensation expense	3,236	$ 3,236
Net tax deficit from exercise of stock options and restricted share vesting	(846)	$ (846)
Conversion of Class B shares to Class A shares (in shares)		15	(15)
Conversion of Class B shares to Class A shares		$ 2	$ (2)
Balance (in shares) at Jul. 29, 2017		10,562	4,304			477
Balance at Jul. 29, 2017	286,820	$ 57,852	$ 699	244,308	(7,406)	$ (8,633)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,080			25,080
Other comprehensive income, net of tax	815			1,594	(779)
Dividends	$ (12,878)			(12,878)
Exercise of stock options (in shares)	(8)					(8)
Exercise of stock options	$ 225	$ 111				$ 114
Treasury stock purchases (in shares)						27
Treasury stock purchases	(632)					$ (632)
Restricted shares forfeited (in shares)		(8)
Restricted shares forfeited	(59)	$ (59)
Share-based compensation expense (in shares)		21
Share-based compensation expense	3,774	$ 3,774
Balance (in shares) at Jul. 28, 2018		10,575	4,304			496
Balance at Jul. 28, 2018	$ 303,145	$ 61,678	$ 699	$ 258,104	$ (8,185)	$ (9,151)