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Commitments and Contingencies (Details Textuals) - USD ($)
$ in Millions
 12 Months Ended
Aug. 04, 2015
Jun. 22, 2015
Jun. 05, 2015
Jun. 04, 2015
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Major Operating and Capital Expenses [Abstract]              
Outstanding letter of credit         $ 17.5    
Facilities Rental Expense              
Major Operating and Capital Expenses [Abstract]              
Rental expense         21.7 $ 26.4 $ 20.6
Yard Operations Equipment Rental Expense              
Major Operating and Capital Expenses [Abstract]              
Rental expense         $ 3.6 $ 3.0 $ 2.8
Georgia Department of Revenue | Insurance-related Assessments              
Major Operating and Capital Expenses [Abstract]              
Sales tax liability contingency   $ 100.0 $ 2.7 $ 73.8      
Subsequent Event | Georgia Department of Revenue | Insurance-related Assessments              
Major Operating and Capital Expenses [Abstract]              
Sales tax liability contingency $ 96.1