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Retirement and Profit Sharing Plans (Details)
$ in Millions
 12 Months Ended
Jul. 31, 2019
USD ($)
hour
Jul. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Retirement Benefits [Abstract]      
Employee contribution percentage 100.00%    
Company match amount equal to participant's contribution 50.00%    
Employer contribution matching equal to 50% 6.00%    
Employment period (in months) 12 months    
Service period (in hours) 1,000    
Total service period (in hours) 1,500    
Retirement plan expense | $ $ 7.9 $ 6.9 $ 5.4