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Stock-Based Compensation (Performance Shares, RSUs, Restricted Stock and Share Unit Awards) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2017
Jan. 31, 2022
USD ($)
$ / shares
shares
Oct. 31, 2021
$ / shares
shares
Jan. 31, 2021
USD ($)
Jan. 31, 2022
USD ($)
$ / shares
shares
Jan. 31, 2021
USD ($)
Jul. 31, 2019
Jul. 31, 2021
USD ($)
Jul. 31, 2020
Jul. 31, 2018
Dividend Equivalents [Abstract]                    
Accrual of dividend equivalents, net of reversal ($0.10 per share)   $ (129,000)   $ (49,000) $ (217,000) $ (191,000)        
Carrying value at period end   425,123,000     425,123,000     $ 492,392,000    
Income tax (expense) benefit from settlement of stock-based awards   $ 86,000   (8,000) $ 139,000 (207,000)        
Performance shares, RSUs, Restricted stock and share units                    
Awards (In Shares)                    
Outstanding, Beginning Balance (in shares) | shares   1,065,341 1,068,370   1,068,370          
Granted (in shares) | shares   187,658 228,161              
Settled (in shares) | shares   (191,238) (190,310)              
Canceled/Forfeited (in shares) | shares   (15,156) (40,880)              
Outstanding, Ending Balance (in shares) | shares   1,046,605 1,065,341   1,046,605          
Vested, Ending Balance (in shares) | shares   444,490     444,490          
Vested and Expected to Vest, Ending Balance (in shares) | shares   1,009,648     1,009,648          
Weighted Average Grant Date Fair Value                    
Outstanding, Beginning Balance (in dollars per share) | $ / shares   $ 22.56 $ 21.93   $ 21.93          
Granted (in dollars per share) | $ / shares   23.35 26.81              
Settled (in dollars per share) | $ / shares   22.47 23.97              
Canceled/Forfeited (in dollars per share) | $ / shares   21.88 23.15              
Outstanding, Ending Balance (in dollars per share) | $ / shares   22.73 $ 22.56   22.73          
Vested, Ending Balance (in dollars per share) | $ / shares   22.12     22.12          
Vested and Expected to Vest, Ending Balance (in dollars per share) | $ / shares   $ 22.71     $ 22.71          
Aggregate Intrinsic Value                    
Outstanding, Ending Balance   $ 21,277,000     $ 21,277,000          
Vested, Ending Balance         9,036,000          
Vested and Expected to Vest, Ending Balance   20,526,000     20,526,000          
Additional Disclosures                    
Total intrinsic value relating to fully vested stock-based awards converted during the period   $ 4,569,000   $ 9,000 $ 9,464,000 $ 2,905,000        
Performance shares | Employees | Granted since fiscal 2014                    
Additional Disclosures                    
Performance period (in years)         3 years          
RSUs and restricted stock | Employees                    
Additional Disclosures                    
Vesting period         5 years          
Common stock, conversion ratio (in shares)   1     1          
RSUs and restricted stock | Non-Employee Director                    
Additional Disclosures                    
Vesting period         5 years   3 years      
Common stock, conversion ratio (in shares)                 1  
RSUs and restricted stock | Non-Employee Director | Tranche One                    
Additional Disclosures                    
Vesting period         1 month          
RSUs and restricted stock | Non-Employee Director | Tranche Two                    
Additional Disclosures                    
Vesting period         11 months          
Share units                    
Additional Disclosures                    
Common stock, conversion ratio (in shares)                   1
Conversion period of vested share units 1 year                  
Number of units settled to date (in shares) | shares   956,576     956,576          
Dividend equivalents                    
Dividend Equivalents [Abstract]                    
Accrual of dividend equivalents, net of reversal ($0.10 per share)   $ (129,000)     $ (217,000)          
Paid during the period   210,000     525,000          
Carrying value at period end   $ 577,000     $ 577,000     $ 884,000    
RSU | CEO                    
Additional Disclosures                    
Vesting period         3 years