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Commitments and Contingencies (Details)
$ in Thousands, R$ in Millions
3 Months Ended
Oct. 27, 2018
USD ($)
Employee
Oct. 27, 2018
BRL (R$)
Jul. 31, 2018
USD ($)
Loss Contingencies [Abstract]      
Other accrued liabilities | $ $ 1,421   $ 1,382
Pending Litigation [Member] | Ecology and Environment do Brasil LTDA [Member]      
Loss Contingencies [Abstract]      
Loss contingency, estimate of possible loss | R$   R$ 0.5  
Number of employees individually served with notices of infraction 4    
Settled Litigation [Member] | Ecology and Environment do Brasil LTDA [Member]      
Loss Contingencies [Abstract]      
Number of employees individually served with claim of violations dismissed 1    
Number of employees that have fines assessed against them, which are being appealed 3    
Other accrued liabilities | $ $ 400