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]
Stock option exercises and restricted stock vestings, net of tax		350,000
Stock option exercises and restricted stock vestings, net of tax	(4,156)	$ 4	(4,160)
Share-based compensation	$ 13,846		13,846
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	2,920			2,920
Foreign currency translation adjustments	839			839
Net income	$ 80,991				80,991
Ending Balance (shares) at Jan. 27, 2018	50,408,000	50,972,000
Ending Balance at Jan. 27, 2018	$ 1,754,740	$ 510	$ 471,118	$ (10,204)	$ 1,315,553
Treasury Stock, Shares	565,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Common, Value	$ (22,237)