Commitments and Contingencies (Details) $ in Thousands, R$ in Millions	3 Months Ended
	Nov. 02, 2019 USD ($) Employee	Nov. 02, 2019 BRL (R$)	Oct. 14, 2019 Complaint	Jul. 31, 2019 USD ($)
Loss Contingencies [Abstract]
Other accrued liabilities | $	$ 1,146			$ 1,386
Number of complaints challenging merger | Complaint			2
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