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Credit Facility (Details)
 12 Months Ended
Oct. 31, 2018
Jul. 31, 2021
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2019
USD ($)
Line of Credit Facility [Line Items]        
Write-off of deferred financing costs   $ 0 $ 0 $ 3,217,000
Credit Facility        
Line of Credit Facility [Line Items]        
Accordion feature   250,000,000    
Triggering event debt issuance amount   $ 5,000,000    
Triggering event period   91 days    
Credit facility amount outstanding   $ 201,000,000    
Outstanding standby letters of credit at period end   1,503,000    
Outstanding balance during period, minimum   125,000,000    
Outstanding balance during period, maximum   219,000,000    
Capitalized deferred financing costs   1,824,000    
Interest expense related to credit facility   $ 5,628,000 $ 5,905,000 $ 8,859,000
Weighted average interest rate   2.84% 3.87% 5.25%
Maximum Secured Leverage Ratio 3.75 3.75    
Maximum Total Leverage Ratio 4.50      
Minimum Interest Expense Coverage Ratio 3.25 3.25    
Actual Secured Leverage Ratio   2.53    
Actual Interest Expense Coverage Ratio   13.05    
Credit Facility | Federal Funds Effective Swap Rate        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   0.50%    
Credit Facility | Adjusted LIBO Rate        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   1.00%    
Secured Credit Facility | Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 550,000,000    
Revolving Loan Facility | Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity   300,000,000    
Letter of Credit | Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity   35,000,000    
Swingline Loan | Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 25,000,000