CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 02, 2020	May 04, 2019	May 02, 2020	May 04, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (643.5)	$ (237.9)	$ (709.2)	$ (303.5)
Other comprehensive loss, net of tax:
Foreign currency translation adjustment	(2.9)	(0.7)	(2.3)	(1.1)
Reclassification of interest rate hedge deferred loss into earnings	1.7	0.0	2.6	0.0
Deferred loss related to interest rate hedge	(3.5)	0.0	(4.7)	0.0
Total other comprehensive loss, net of tax	(4.7)	(0.7)	(4.4)	(1.1)
Total comprehensive loss	$ (648.2)	$ (238.6)	$ (713.6)	$ (304.6)