CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Apr. 28, 2018	Jul. 29, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowance (in dollars)	$ 18,185	$ 13,939
Intangible assets, accumulated amortization (in dollars)	$ 60,888	$ 49,926
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares	5,000	5,000
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	100,000
Common stock, issued shares	51,006	50,622
Common stock, outstanding shares	50,441	50,622