Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Nov. 02, 2019	Oct. 27, 2018
Condensed Consolidated Statements of Operations (Unaudited) [Abstract]
Gross revenue	$ 22,213	$ 21,752
Cost of professional services and other direct operating expenses	9,543	8,134
Subcontract costs	3,472	4,574
Selling, general and administrative expenses	10,715	9,200
Depreciation and amortization	234	277
Loss from operations	(1,751)	(433)
Income from equity method investment	79	60
Net interest income	59	54
Net foreign exchange gain	1	23
Other income	18	26
Loss before income tax benefit	(1,594)	(270)
Income tax benefit	(194)	(155)
Net loss	(1,400)	(115)
Net income attributable to noncontrolling interests	(127)	(5)
Net loss attributable to Ecology and Environment Inc.	$ (1,527)	$ (120)
Net loss per common share: basic and diluted (in dollars per share)	$ (0.35)	$ (0.03)
Weighted average common shares outstanding: basic and diluted (in shares)	4,329,858	4,313,930