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Equity Method Investment (Details) - USD ($)
$ in Thousands
Jul. 18, 2019
Aug. 02, 2019
Aug. 03, 2018
Equity method investments [Abstract]      
Investment in unconsolidated subsidiary   $ 89,100 $ 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   $ 12,500  
PBS HC [Member] | Maximum [Member]      
Equity method investments [Abstract]      
Agreed funding amount $ 51,000