CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 01, 2020	Feb. 02, 2019	Feb. 01, 2020	Feb. 02, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (97.4)	$ (71.5)	$ (65.7)	$ (65.6)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	0.4	0.0	0.6	(0.4)
Reclassification of interest rate hedge deferred loss into earnings	0.6		0.9
Deferred loss related to interest rate hedge	(0.9)	0.0	(1.2)	0.0
Total other comprehensive income (loss), net of tax	0.1	0.0	0.3	(0.4)
Total comprehensive loss	$ (97.3)	$ (71.5)	$ (65.4)	$ (66.0)