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Equity Method Investment (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 18, 2019
USD ($)
May 01, 2020
USD ($)
Jul. 31, 2020
USD ($)
Location
Aug. 02, 2019
USD ($)
Aug. 03, 2018
USD ($)
Equity method investments [Abstract]          
Investment in unconsolidated subsidiary     $ 0 $ 89,100  
Loss from unconsolidated subsidiary     (142,442) 0 $ 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 $ 12,500  
Number of locations where all operations were suspended | Location     19    
Loss from unconsolidated subsidiary   $ (132,878) $ (132,878)    
PBS HC [Member] | Maximum [Member]          
Equity method investments [Abstract]          
Agreed funding amount $ 51,000