Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 27, 2019	Apr. 28, 2018
Condensed Consolidated Statements of Operations (Unaudited) [Abstract]
Gross revenue	$ 21,775	$ 20,677	$ 63,780	$ 68,071
Cost of professional services and other direct operating expenses	8,810	7,910	24,718	24,494
Subcontract costs	2,992	2,640	11,185	13,418
Selling, general and administrative expenses	10,504	9,949	29,156	29,213
Depreciation and amortization	243	282	784	801
(Loss) income from operations	(774)	(104)	(2,063)	145
Income from equity method investment	64	137	295	376
Net interest income (expense)	32	58	130	56
Net foreign exchange gain (loss)	(7)	11	2	(10)
Other income (expense)	(42)	25	(35)	37
(Loss) income before income tax provision	(727)	127	(1,671)	604
Income tax provision (benefit)	227	(38)	(292)	279
Net (loss) income	(954)	165	(1,379)	325
Net income attributable to noncontrolling interests	(76)	(96)	(80)	(187)
Net (loss) income attributable to Ecology and Environment Inc.	$ (1,030)	$ 69	$ (1,459)	$ 138
Net (loss) income per common share: basic and diluted (in dollars per share)	$ (0.24)	$ 0.02	$ (0.34)	$ 0.03
Weighted average common shares outstanding: basic and diluted (in shares)	4,315,135	4,301,604	4,314,742	4,301,604