CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 27, 2017	Jan. 29, 2016	Jan. 27, 2017	Jan. 29, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net income	$ 52,727	$ 48,242	$ 101,082	$ 89,107
Other comprehensive income (loss) before income tax expense (benefit):
Change in fair value of interest rate swaps	11,394	(5,048)	17,500	(9,930)
Income tax expense (benefit)	4,358	(1,931)	6,693	(3,780)
Other comprehensive income (loss), net of tax	7,036	(3,117)	10,807	(6,150)
Comprehensive income	$ 59,763	$ 45,125	$ 111,889	$ 82,957