CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid in Capital	Unallocated Shares of ESOP	Accumulated Other Comprehensive (Loss) Income	Retained Earnings
Balances at Aug. 02, 2014	$ 1,238,919	$ 498	$ 0	$ 402,875	$ (14)	$ (5,152)	$ 840,712
Balances (in shares) at Aug. 02, 2014		49,771	0
Increase (Decrease) in Stockholders' Equity
Allocation of shares to ESOP	14				14
Stock option exercises and restricted stock vestings, net	985	$ 3		982
Stock option exercises and restricted stock vestings, net (in shares)		325
Share-based compensation	13,981			13,981
Tax benefit associated with stock plans	2,746			2,746
Fair value of swap agreement, net of tax	(439)					(439)
Foreign currency translation	(13,852)					(13,852)
Net Income	138,734						138,734
Balances at Aug. 01, 2015	1,381,088	$ 501	$ 0	420,584	0	(19,443)	979,446
Balances (in shares) at Aug. 01, 2015		50,096	0
Increase (Decrease) in Stockholders' Equity
Stock option exercises and restricted stock vestings, net	294	$ 3		291
Stock option exercises and restricted stock vestings, net (in shares)		287
Share-based compensation	15,308			15,308
Share-based compensation / restructuring costs	67			67
Tax deficit associated with stock plans	(83)			(83)
Fair value of swap agreement, net of tax	(3,141)					(3,141)
Foreign currency translation	205					205
Net Income	125,766						125,766
Balances at Jul. 30, 2016	$ 1,519,504	$ 504	$ 0	436,167	0	(22,379)	1,105,212
Balances (in shares) at Jul. 30, 2016	50,096	50,383	0
Increase (Decrease) in Stockholders' Equity
Stock option exercises and restricted stock vestings, net	$ (1,039)	$ 2	$ 0	(1,041)
Stock option exercises and restricted stock vestings, net (in shares)		239	0
Share-based compensation	25,675			25,675
Share-based compensation / restructuring costs	530			530
Tax deficit associated with stock plans	(1,320)			(1,320)
Fair value of swap agreement, net of tax	4,879					4,879
Foreign currency translation	3,537					3,537
Net Income	130,155						130,155
Balances at Jul. 29, 2017	$ 1,681,921	$ 506	$ 0	$ 460,011	$ 0	$ (13,963)	$ 1,235,367
Balances (in shares) at Jul. 29, 2017	50,383	50,622	0