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Shareholder Rights Plan (Details)
12 Months Ended
Jul. 31, 2020
Right
$ / shares
shares
Aug. 02, 2019
$ / shares
Shareholder Rights Plan [Abstract]    
Par value of common share outstanding (in dollars per share) $ 0.01 $ 0.01
Rights Agreement [Member]    
Shareholder Rights Plan [Abstract]    
Dividend declaration date Apr. 09, 2018  
Number of preferred share purchase right declared as dividend for each share of common stock outstanding | Right 1  
Par value of common share outstanding (in dollars per share) $ 0.01  
Dividend record date Apr. 19, 2018  
Dividend payment date Apr. 19, 2018  
Rights expiration date Apr. 09, 2021  
Exercise price of each right (in dollars per share) $ 600.00  
Rights exercisable (in shares) | shares 0  
Exercise price of each right, if a person or group becomes an acquiring person (in dollars per share) $ 600.00  
Market value expressed in multiple of exercise price, if a person or group becomes an acquiring person 2  
Market value of each right If a person or group becomes an acquiring person (in dollars per share) $ 1,200.00  
Exercise price of each right, if the company is later acquired in a merger (in dollars per share) $ 600.00  
Market value expressed in multiple of exercise price, if the company is later acquired in a merger 2  
Market value of each right, if the company is later acquired in a merger (in dollars per share) $ 1,200.00  
Redemption price of the right (in dollars per share) $ 0.01  
Subsequent offering period 20 days  
Number of common stock shares that can be exchanged for each right if rights were extinguished (in shares) | shares 1  
Rights Agreement [Member] | Minimum [Member]    
Shareholder Rights Plan [Abstract]    
Period before rights can be exercised 10 days  
Percentage of outstanding common stock ownership required to qualify for an "Acquiring Person" 20.00%  
Offering period 60 days  
Percentage of an ownership of common stock by an Acquiring Person before board of directors may extinguish right 50.00%  
Percentage of adjustment to exercise price 1.00%  
Rights Agreement [Member] | Series A Junior Participating Preferred Stock [Member]    
Shareholder Rights Plan [Abstract]    
Common share equivalent for each preferred share portion (in shares) | shares 1  
Quarterly dividends payments per share (in dollars per share) $ 0.01  
Amount entitled to receive per share upon liquidation of preferred share (in dollars per share) $ 1.00  
2015 Plan [Member]    
Shareholder Rights Plan [Abstract]    
Rights expiration date Apr. 09, 2018