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Long-Term Debt and Revolving Credit Facility - Narrative (Details) - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jul. 31, 2021
Debt Instrument [Line Items]        
Maturities year one $ 30,000      
Maturities year two 33,000      
Maturities year three 36,000      
Maturities year four $ 40,010,000      
Weighted average interest rate on borrowings outstanding 1.40% 9.25%    
Interest paid on borrowings $ 382,000 $ 15,000 $ 87,000  
Adjusted leverage ratio, indebtedness reduction for excess cash $ 15,000,000      
Adjusted leverage ratio covenant 300.00%      
Interest coverage ratio covenant 3.00      
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 125,000,000      
Borrowing capacity on the credit facility 83,300,000      
Maximum borrowing increase in capacity upon request 200,000,000      
Amount available for letters of credit $ 10,000,000      
Interest Rate Swap | Designated as Hedging Instrument | Subsequent Event        
Debt Instrument [Line Items]        
Derivative, notional amount       $ 40,000,000
Minimum | Revolving Credit Facility        
Debt Instrument [Line Items]        
Unused capacity, commitment fee percentage (basis points) 0.20%      
Maximum        
Debt Instrument [Line Items]        
Adjusted leverage ratio, indebtedness reduction for excess cash $ 35,000,000      
Maximum | Revolving Credit Facility        
Debt Instrument [Line Items]        
Unused capacity, commitment fee percentage (basis points) 0.30%      
Financial Standby Letter of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding $ 1,700,000      
Eurocurrency Loans Margin | Minimum | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate (basis points) 1.25%      
Eurocurrency Loans Margin | Maximum | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate (basis points) 2.00%      
London Interbank Offered Rate (LIBOR) | Primary Credit Facility        
Debt Instrument [Line Items]        
Interest rate charged over index rate 1.00%      
Federal Funds Rate | Primary Credit Facility        
Debt Instrument [Line Items]        
Interest rate charged over index rate 0.50%      
Alternate Base Rate Loans Spread | Minimum | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate (basis points) 0.25%      
Alternate Base Rate Loans Spread | Maximum | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate (basis points) 1.00%