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Subsequent Events Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Oct. 31, 2019
Aug. 01, 2019
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Line of credit, current borrowing capacity           $ 200,000
Line of credit, maximum borrowing capacity           $ 400,000
Dividends $ 0.87          
Dividends Payable, Amount Per Share         $ 0.2175  
Percentage Increase In Dividend 2.40%          
Nonvoting Common Stock [Member]            
Subsequent Event [Line Items]            
Dividends   $ 0.85 $ 0.83 $ 0.82