Consolidated Statements Of Changes In Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income
Balance at Jul. 25, 2011	$ 423,472	$ 627	$ 85,407	$ 325,941	$ 11,497
Balance (in shares) at Jul. 25, 2011		12,535,007
Shares issued for:
Stock options exercised (in shares)		35,922
Stock options exercised	1,626	2	1,624
Stock grants and vesting of restricted stock units, net of shares traded for taxes (in shares)		8,019
Stock grants and vesting of restricted stock units, net of shares traded for taxes	2,004		2,004
Stock purchase plan (in shares)		7,757
Stock purchase plan	375		375
Share-based compensation expense	13,396		13,396
Tax benefit from share-based compensation	67		67
Repurchase of common stock (in shares)		(423,981)
Repurchase of common stock	(23,260)	(21)	(2,651)	(20,588)
Dividends declared ($0.40 per share)	(5,238)			(5,238)
Net income for the year	43,071			43,071
Other comprehensive income, net of tax	(9,194)				(9,194)
Balance at Jul. 31, 2012	446,319	608	100,222	343,186	2,303
Balance (in shares) at Jul. 31, 2012		12,162,724
Shares issued for:
Stock options exercised (in shares)		72,259
Stock options exercised	4,259	4	4,255
Stock grants and vesting of restricted stock units, net of shares traded for taxes (in shares)		104,761
Stock grants and vesting of restricted stock units, net of shares traded for taxes	(3,121)	5	(3,126)
Stock purchase plan (in shares)		7,488
Stock purchase plan	431		431
Share-based compensation expense	11,601		11,601
Tax benefit from share-based compensation	1,919		1,919
Repurchase of common stock (in shares)		(111,816)
Repurchase of common stock	(7,945)	(5)	(921)	(7,019)
Dividends declared ($0.40 per share)	(5,033)			(5,033)
Net income for the year	31,121			31,121
Other comprehensive income, net of tax	6,845				6,845
Balance at Jul. 31, 2013	486,396	612	114,381	362,255	9,148
Balance (in shares) at Jul. 31, 2013	12,235,416	12,235,416
Shares issued for:
Stock options exercised (in shares)		81,538
Stock options exercised	4,885	4	4,881
Stock grants and vesting of restricted stock units, net of shares traded for taxes (in shares)		233,799
Stock grants and vesting of restricted stock units, net of shares traded for taxes	(7,622)	12	(7,634)
Stock purchase plan (in shares)		7,283
Stock purchase plan	491		491
Share-based compensation expense	11,457		11,457
Tax benefit from share-based compensation	3,824		3,824
Repurchase of common stock (in shares)		(185,044)
Repurchase of common stock	(14,959)	(9)	(1,721)	(13,229)
Dividends declared ($0.40 per share)	(5,029)			(5,029)
Net income for the year	34,480			34,480
Other comprehensive income, net of tax	(1,343)				(1,343)
Balance at Jul. 31, 2014	$ 512,580	$ 619	$ 125,679	$ 378,477	$ 7,805
Balance (in shares) at Jul. 31, 2014	12,372,992	12,372,992