Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Oct. 27, 2018	Oct. 28, 2017
Condensed Consolidated Statements of Operations (Unaudited) [Abstract]
Gross revenue	$ 21,752	$ 26,105
Cost of professional services and other direct operating expenses	8,134	8,618
Subcontract costs	4,574	6,349
Selling, general and administrative expenses	9,200	9,782
Depreciation and amortization	277	260
(Loss) income from operations	(433)	1,096
Income from equity method investment	60	18
Net interest income	54	2
Net foreign exchange gain	23	5
Other income	26	0
(Loss) income before income tax provision	(270)	1,121
Income tax (benefit) provision	(155)	433
Net (loss) income	(115)	688
Net income attributable to noncontrolling interests	(5)	(100)
Net (loss) income attributable to Ecology and Environment Inc.	$ (120)	$ 588
Net (loss) income per common share: basic and diluted (in dollars per share)	$ (0.03)	$ 0.14
Weighted average common shares outstanding: basic and diluted (in shares)	4,313,930	4,301,604