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Credit Facility (Details)
 3 Months Ended 6 Months Ended
Oct. 31, 2018
Jan. 31, 2022
USD ($)
Jan. 31, 2021
USD ($)
Jan. 31, 2022
USD ($)
Jan. 31, 2021
USD ($)
Credit Facility          
Line of Credit Facility [Line Items]          
Accordion feature   $ 250,000,000   $ 250,000,000  
Triggering event debt issuance amount   5,000,000   $ 5,000,000  
Triggering event period       91 days  
Credit facility amount outstanding   114,500,000   $ 114,500,000  
Outstanding standby letters of credit at period end   1,007,000   1,007,000  
Outstanding balance during period, minimum       100,000,000  
Outstanding balance during period, maximum       212,000,000  
Debt issuance costs, net   1,419,000   1,419,000  
Interest expense related to credit facility   $ 981,000 $ 1,414,000 $ 2,474,000 $ 2,525,000
Weighted average interest rate   3.40% 2.73% 3.10% 2.71%
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       1.95  
Actual Interest Expense Coverage Ratio       11.91  
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   $ 550,000,000  
Revolving Loan Facility | Credit Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity   300,000,000   300,000,000  
Letter of Credit | Credit Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity   35,000,000   35,000,000  
Swingline Loan | Credit Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity   25,000,000   25,000,000  
Commercial Letter of Credit          
Line of Credit Facility [Line Items]          
Outstanding standby letters of credit at period end   $ 0   $ 0