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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Jan. 28, 2017
Jan. 30, 2016
Earnings Per Share [Abstract]        
Minimum percentage right of Class B common stock holders to elect Board of Directors     75.00%  
Net income (loss) attributable to Ecology and Environment, Inc. $ (318) $ (481) $ 570 $ 183
Dividends declared (859) (1,034) (859) (1,034)
Balance at end of period $ (1,177) $ (1,515) $ (289) $ (851)
Weighted-average common shares outstanding (basic and diluted) (in shares) 4,294,102 4,291,212 4,293,417 4,289,800
Distributed earnings per share (basic and diluted) (in dollars per share) $ 0.20 $ 0.24 $ 0.20 $ 0.24
Undistributed earnings per share (basic and diluted) (in dollars per share) (0.27) (0.35) (0.07) (0.20)
Net income (loss) per common share (basic and diluted) (in dollars per share) $ (0.07) $ (0.11) $ 0.13 $ 0.04