Equity Method Investment (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 18, 2019 USD ($)	May 01, 2020 USD ($) Location	May 03, 2019 USD ($)	May 01, 2020 USD ($)	May 03, 2019 USD ($)	Aug. 02, 2019 USD ($)
Equity method investments [Abstract]
Investment in unconsolidated subsidiary		$ 0		$ 0		$ 89,100	[1]
Loss from unconsolidated subsidiary		(132,878)	$ 0	(142,442)	$ 0
PBS HC [Member]
Equity method investments [Abstract]
Percentage of economic ownership interest	58.60%
Percentage of voting ownership Interest	49.70%
Investment in unconsolidated subsidiary						89,100
Purchase of promissory notes	$ 6,900
Additional funding provided	8,000
Funding amount paid		$ 48,000		$ 48,000		$ 12,500
Number of location where operations suspended | Location		19
Loss from unconsolidated subsidiary		$ (132,878)
PBS HC [Member] | Maximum [Member]
Equity method investments [Abstract]
Agreed funding amount	$ 51,000

[1] This Condensed Consolidated Balance Sheet has been derived from the audited Consolidated Balance Sheet as of August 2, 2019, as filed with the Securities and Exchange Commission in the Company’s Annual Report on Form 10-K for the fiscal year ended August 2, 2019.