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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Nov. 02, 2019
Oct. 27, 2018
Earnings Per Share [Abstract]    
Net loss attributable to Ecology and Environment Inc. $ (1,527) $ (120)
Dividends declared 0 0
Balance at end of period $ (1,527) $ (120)
Weighted-average common shares outstanding - basic and diluted (in shares) 4,329,858 4,313,930
Distributed earnings per share - basic and diluted (in dollars per share) $ 0 $ 0
Undistributed (losses) earnings per share - basic and diluted (in dollars per share) (0.35) (0.03)
Net income per common share - basic and diluted (in dollars per share) $ (0.35) $ (0.03)