CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	May 01, 2020	Apr. 30, 2021	May 01, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income (loss)	$ 33,470	$ (161,932)	$ 218,150	$ (57,541)
Other comprehensive income (loss) before income tax expense (benefit):
Change in fair value of interest rate swaps	3,941	(13,356)	8,827	(16,591)
Income tax expense (benefit)	983	(3,302)	2,202	(4,050)
Other comprehensive income (loss), net of tax	2,958	(10,054)	6,625	(12,541)
Comprehensive income (loss)	$ 36,428	$ (171,986)	$ 224,775	$ (70,082)