Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 28, 2018	Apr. 29, 2017
Condensed Consolidated Statements of Operations (Unaudited) [Abstract]
Revenue, net	$ 23,728	$ 24,052	$ 75,892	$ 74,094
Cost of professional services and other direct operating expenses	8,793	9,346	27,352	27,787
Subcontract costs	3,585	3,258	15,082	12,616
Administrative and indirect operating expenses	7,657	7,588	22,405	22,447
Marketing and related costs	3,043	2,465	9,033	7,674
Depreciation and amortization	291	265	827	782
Income from operations	359	1,130	1,193	2,788
Net interest (expense) income	52	9	39	(3)
Proxy contest costs, net	0	(550)	0	(550)
Net foreign exchange gain (loss)	15	(9)	(12)	(81)
Other income (expense)	24	(70)	36	(60)
Income before income tax provision	450	510	1,256	2,094
Income tax provision	43	246	797	1,319
Net income	407	264	459	775
Net (income) loss attributable to noncontrolling interests	(243)	(12)	(530)	47
Net income (loss) attributable to Ecology and Environment, Inc.	$ 164	$ 252	$ (71)	$ 822
Net income (loss) per common share: basic and diluted (in dollars per share)	$ 0.04	$ 0.06	$ (0.02)	$ 0.19
Weighted average common shares outstanding: basic and diluted (in shares)	4,301,604	4,294,102	4,301,604	4,293,646