CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Common, Value	$ 0
Beginning Balance (shares) at Jul. 29, 2017	50,622,000	50,622,000
Beginning Balance at Jul. 29, 2017	$ 1,681,921	$ 506	$ 460,011	$ (13,963)	$ 1,235,367
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle					(805)
Stock option exercises and restricted stock vestings, net of tax		384,000
Stock option exercises and restricted stock vestings, net of tax	(3,920)	$ 4	(3,924)
Share-based compensation	$ 21,712		21,712
Treasury Stock, Shares, Acquired	564,660
Treasury Stock, Value, Acquired, Cost Method	$ (22,237)
Adjustments to Additional Paid in Capital, Other	107
Fair value of swap agreements, net of tax	3,649			3,649
Foreign currency translation adjustments	(2,320)			(2,320)
Net income	$ 132,882				132,882
Ending Balance (shares) at Apr. 28, 2018	50,441,000	51,006,000
Ending Balance at Apr. 28, 2018	$ 1,812,303	$ 510	$ 479,220	$ (12,634)	$ 1,367,444
Treasury Stock, Shares	565,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Common, Value	$ (22,237)