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Acquisitions - Omnia (Details) - USD ($)
6 Months Ended
Feb. 01, 2019
Jan. 31, 2019
Jan. 31, 2018
Business Acquisition [Line Items]      
Acquisition of businesses, net of cash acquired   $ 24,047,000 $ 64,287,000
Subsequent Event      
Business Acquisition [Line Items]      
Acquisition of businesses, net of cash acquired $ 23,971,000    
Subsequent Event | Omnia      
Business Acquisition [Line Items]      
Total consideration for the transaction, excluding acquisition-related costs 27,190,000    
Stock consideration 3,219,000    
Subsequent Event | Minimum | Omnia      
Business Acquisition [Line Items]      
Contingent consideration 0    
Subsequent Event | Maximum | Omnia      
Business Acquisition [Line Items]      
Contingent consideration $ 5,800,000