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Earnings Per Share (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jan. 26, 2019
USD ($)
Class
$ / shares
shares
Jan. 27, 2018
USD ($)
$ / shares
shares
Jan. 26, 2019
USD ($)
Class
$ / shares
shares
Jan. 27, 2018
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   2  
Net (loss) income attributable to Ecology and Environment Inc. | $ $ (309) $ (519) $ (429) $ 69
Dividends declared | $ 0 0 0 0
Balance at end of period | $ $ (309) $ (519) $ (429) $ 69
Weighted-average common shares outstanding - basic and diluted (in shares) | shares 4,315,135 4,301,604 4,314,543 4,301,604
Distributed earnings per share - basic and diluted (in dollars per share) | $ / shares $ 0 $ 0 $ 0 $ 0
Undistributed losses per share - basic and diluted (in dollars per share) | $ / shares (0.07) (0.12) (0.10) 0.02
Net loss per common share - basic and diluted (in dollars per share) | $ / shares $ (0.07) $ (0.12) $ (0.10) $ 0.02