CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jul. 29, 2017	Jul. 30, 2016
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 13,939	$ 9,638
Intangible assets, accumulated amortization	$ 49,926	$ 34,315
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares	5,000,000	5,000,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	100,000,000	100,000,000
Common stock, issued shares	50,622,000	50,383,000
Common stock, outstanding shares	50,383,000	50,096,000