Commitments and Contingencies (Details) $ in Thousands, R$ in Millions	12 Months Ended
	Jul. 31, 2019 USD ($) Employee	Oct. 14, 2019 Complaints	Jul. 31, 2019 BRL (R$)	Jul. 31, 2018 USD ($)
Loss Contingencies [Abstract]
Other accrued liabilities | $	$ 1,386			$ 1,382
Subsequent Event [Member]
Loss Contingencies [Abstract]
Number of complaints challenging merger were filed | Complaints		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