CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Class A Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Retained Earnings	Accumulated other comprehensive income (loss)	Treasury Stock Class A
Balance (in shares) at Jul. 28, 2012			7,883,000	6,335,000			461,000
Balance at Jul. 28, 2012	$ 230,311		$ 39,570	$ 1,028	$ 209,373	$ (15,474)	$ (4,186)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,784				25,784
Other comprehensive income (loss), net of tax	7,007					7,007
Dividends	(24,048)				(24,048)
Exercise of stock options	$ 1,742		$ 957				$ 785
Exercise of stock options (in shares)	(86,000)						(86,000)
Share-based compensation expense (in shares)			2,000
Share-based compensation expense	$ 3,222		$ 3,222
Tax (deficit) benefit from exercise of stock options and restricted share vesting	542		$ 542
Conversion of Class B shares to Class A shares (in shares)			1,555,000	(1,555,000)
Conversion of Class B shares to Class A shares	0		$ 252	$ (252)
Balance (in shares) at Jul. 27, 2013			9,440,000	4,780,000			375,000
Balance at Jul. 27, 2013	244,560		$ 44,543	$ 776	211,109	(8,467)	$ (3,401)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,045				5,045
Other comprehensive income (loss), net of tax	(3,998)					(3,998)
Dividends	(12,432)				(12,432)
Exercise of stock options	$ 217		$ 132				$ 85
Exercise of stock options (in shares)	(9,000)						(9,000)
Treasury stock purchases (in shares)							88,000
Treasury stock purchases	$ (2,569)						$ (2,569)
Share-based compensation expense (in shares)			288,000
Share-based compensation expense	3,229		$ 3,229
Tax (deficit) benefit from exercise of stock options and restricted share vesting	(916)		$ (916)
Conversion of Class B shares to Class A shares (in shares)			419,000	(419,000)
Conversion of Class B shares to Class A shares	0		$ 68	$ (68)
Balance (in shares) at Jul. 26, 2014			10,147,000	4,361,000			454,000
Balance at Jul. 26, 2014	233,136		$ 47,056	$ 708	203,722	(12,465)	$ (5,885)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30,620				30,620
Other comprehensive income (loss), net of tax	(4,409)					(4,409)
Dividends	(12,577)				(12,577)
Exercise of stock options	$ 2,392		$ 950				$ 1,442
Exercise of stock options (in shares)	(111,000)						(111,000)
Treasury stock purchases (in shares)		0
Share-based compensation expense (in shares)			3,000
Share-based compensation expense	$ 3,169		$ 3,169
Tax (deficit) benefit from exercise of stock options and restricted share vesting	436		$ 436
Conversion of Class B shares to Class A shares (in shares)			42,000	(42,000)
Conversion of Class B shares to Class A shares	0		$ 7	$ (7)
Balance (in shares) at Jul. 25, 2015			10,192,000	4,319,000			343,000
Balance at Jul. 25, 2015	$ 252,767		$ 51,618	$ 701	$ 221,765	$ (16,874)	$ (4,443)