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Financing - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2022
Aug. 24, 2017
Aug. 17, 2017
Jul. 01, 2015
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2018
Jun. 30, 2020
Jun. 30, 2017
Line of Credit Facility [Line Items]                    
Long-term debt         $ 74,141,000 $ 74,141,000     $ 82,839,000  
Repayments of debt           8,800,000 $ 0      
Term loan         75,000,000 75,000,000     75,000,000  
Debt issuance costs         859,000 859,000     $ 961,000  
Derivative, term of contract       5 years            
Fixed quarterly interest rate (as a percent)       1.52%            
Derivative notional amount       $ 39,250,000            
Outstanding balance (equal to) (as a percent)       50.00%            
Derivative, loss on derivative             $ 38,000      
Credit Agreement                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity         120,000,000 120,000,000        
Long-term debt         75,000,000 75,000,000        
Outstanding letters of credit         1,185,000 1,185,000        
Repayments of debt         8,800,000          
Purchase of stock (up to)           2,000,000        
Share repurchase (up to)           35,000,000        
Dividend and distributions (up to)           10,000,000        
Deferred finance costs                   $ 2,074,000
Debt issuance costs         671,000 671,000        
Credit Agreement | Long-term Debt                    
Line of Credit Facility [Line Items]                    
Repayments of debt   $ 50,000,000                
Term loan         75,000,000 75,000,000        
Write off of deferred debt issuance cost               $ 829,000    
Credit Agreement | Long-term Debt | Forecast                    
Line of Credit Facility [Line Items]                    
Debt instrument, periodic payment $ 3,000,000                  
Credit Agreement | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Available borrowing capacity         $ 0 $ 0        
Stated interest rate (as a percent)         1.40% 1.40%        
Credit Agreement | Revolving Credit Facility | Minimum                    
Line of Credit Facility [Line Items]                    
Line of credit facility, unused capacity, commitment fee rate (as a percent)           0.20%        
Credit Agreement | Revolving Credit Facility | Maximum                    
Line of Credit Facility [Line Items]                    
Line of credit facility, unused capacity, commitment fee rate (as a percent)           0.40%        
Credit Agreement | Revolving Credit Facility | Federal Funds                    
Line of Credit Facility [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent)           0.50%        
Credit Agreement | Revolving Credit Facility | Base Rate                    
Line of Credit Facility [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent)           1.00%        
Credit Agreement | Revolving Credit Facility | Base Rate | Minimum                    
Line of Credit Facility [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent)           0.25%        
Credit Agreement | Revolving Credit Facility | Base Rate | Maximum                    
Line of Credit Facility [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent)           1.25%        
Credit Agreement | Revolving Credit Facility | LIBOR | Minimum                    
Line of Credit Facility [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent)           1.25%        
Credit Agreement | Revolving Credit Facility | LIBOR | Maximum                    
Line of Credit Facility [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent)           2.25%        
Credit Agreement | Long-term Debt                    
Line of Credit Facility [Line Items]                    
Repayments of debt     $ 50,000,000