CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Apr. 27, 2019	Jul. 28, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance (in dollars)	$ 13,972	$ 15,996
Intangible assets, accumulated amortization (in dollars)	$ 108,493	$ 64,438
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	51,719,000	51,025,000
Common stock, outstanding shares	51,104,000	50,411,000