CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	Common Stock, Shares	Common Stock	Additional Paid-in Capital	AOCI Attributable to Parent	Retained Earnings
Beginning Balance, shares at Jul. 27, 2013		33,264,117
Beginning Balance, value at Jul. 27, 2013	$ 428,361		$ 11,088	$ 115,205	$ 103	$ 301,965
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (shares)		803,796
Stock options exercised	14,568		268	14,300
Stock-based compensation	12,596		1	12,595
Stock-based compensation (shares)		3,999
Issuance of restricted stock, net of tax withholdings	(3,781)		93	(3,874)
Issuance of restricted stock, net of tax withholdings (shares)		279,577
Repurchase of common stock	$ (9,999)		(120)	(9,879)
Repurchase of common stock (shares)	(360,900)	(360,900)
Other comprehensive loss	$ (261)				(261)
Tax benefits from stock-based compensation	3,472			3,472
Net income	39,978					39,978
Ending Balance, shares at Jul. 26, 2014		33,990,589
Ending Balance, value at Jul. 26, 2014	484,934		11,330	131,819	(158)	341,943
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (shares)		735,330
Stock options exercised	8,922		245	8,677
Stock-based compensation	13,923		1	13,922
Stock-based compensation (shares)		4,062
Issuance of restricted stock, net of tax withholdings	(4,711)		107	(4,818)
Issuance of restricted stock, net of tax withholdings (shares)		321,722
Repurchase of common stock	$ (87,146)		(556)	(86,590)
Repurchase of common stock (shares)	(1,669,924)	(1,669,924)
Other comprehensive loss	$ (1,040)				(1,040)
Tax benefits from stock-based compensation	7,994			7,994
Net income	$ 84,324					84,324
Ending Balance, shares at Jul. 25, 2015	33,381,779	33,381,779
Ending Balance, value at Jul. 25, 2015	$ 507,200		11,127	71,004	(1,198)	426,267
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (shares)		212,619
Stock options exercised	2,745		71	2,674
Stock-based compensation	16,850		1	16,849
Stock-based compensation (shares)		3,015
Issuance of restricted stock, net of tax withholdings	(12,604)		111	(12,715)
Issuance of restricted stock, net of tax withholdings (shares)		334,475
Repurchase of common stock	$ (169,997)		(837)	(152,033)		(17,127)
Repurchase of common stock (shares)	(2,511,578)	(2,511,578)
Other comprehensive loss	$ (76)				(76)
Tax benefits from stock-based compensation	13,003			13,003
Net income	128,740					128,740
Equity component of 0.75% convertible senior notes due 2021, net	112,554			112,554
Sale of warrants	74,690			74,690
Purchase of convertible note hedges	$ (115,818)			(115,818)
Ending Balance, shares at Jul. 30, 2016	31,420,310	31,420,310
Ending Balance, value at Jul. 30, 2016	$ 557,287		$ 10,473	$ 10,208	$ (1,274)	$ 537,880