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Earnings Per Share (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Oct. 27, 2018
USD ($)
Class
$ / shares
shares
Oct. 28, 2017
USD ($)
$ / shares
shares
Earnings Per Share [Abstract]    
Minimum percentage right of Class B common stock holders to elect Board of Directors 75.00%  
Number of classes of common stock | Class 2  
Net income attributable to Ecology and Environment Inc. | $ $ (120) $ 588
Dividends declared | $ 0 0
Balance at end of period | $ $ (120) $ 588
Weighted-average common shares outstanding - basic and diluted (in shares) | shares 4,313,930 4,301,604
Distributed earnings per share - basic and diluted (in dollars per share) | $ / shares $ 0 $ 0
Undistributed (losses) earnings per share - basic and diluted (in dollars per share) | $ / shares (0.03) 0.14
Net income per common share - basic and diluted (in dollars per share) | $ / shares $ (0.03) $ 0.14