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Short-term and Long-term Debt - 2018 Bank of America Credit Facility (Details) - USD ($)
1 Months Ended
May 12, 2020
May 11, 2020
Oct. 31, 2019
Oct. 31, 2018
Apr. 30, 2018
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Short-term Debt [Line Items]                
Debt, total outstanding borrowings           $ 23,704,000   $ 23,647,000
Bank of America 2018 Credit Agreement | Bank of America                
Short-term Debt [Line Items]                
Interest rate (as a percent)           3.00%   4.50%
Line of credit | Revolving Credit Facility And Other Financial Accommodations | Bank of America 2018 Credit Agreement | Bank of America                
Short-term Debt [Line Items]                
Credit facility, maximum borrowing capacity         $ 250,000,000.0      
Line of credit | Revolving Credit Facility | Bank of America 2018 Credit Agreement | Bank of America                
Short-term Debt [Line Items]                
Credit facility, maximum borrowing capacity     $ 15,000,000.0   $ 5,000,000.0      
Credit facility expiration period         364 days      
Amendment fee paid $ 700,000              
Line of credit facility, variable rate threshold, amount outstanding 125,000,000.0              
Line of credit facility, covenant threshold, amount outstanding $ 220,000,000.0              
Line of credit facility, unused capacity, commitment fee percentage 0.375%              
Debt, total outstanding borrowings           $ 0   $ 1,116,000
Commitment fee amount     6,400,000 $ 3,200,000        
Debt issuance costs, gross           600,000   $ 300,000
Credit facility, remaining borrowing capacity           $ 243,600,000    
Line of credit | Revolving Credit Facility | Bank of America 2018 Credit Agreement | Bank of America | LIBOR                
Short-term Debt [Line Items]                
Credit facility, basis spread on variable rate (as a percent)   2.75%            
Line of credit | Revolving Credit Facility | Bank of America 2018 Credit Agreement | Bank of America | LIBOR | Minimum                
Short-term Debt [Line Items]                
Credit facility, basis spread on variable rate (as a percent) 2.00%              
Line of credit | Revolving Credit Facility | Bank of America 2018 Credit Agreement | Bank of America | LIBOR | Maximum                
Short-term Debt [Line Items]                
Credit facility, basis spread on variable rate (as a percent) 2.25%              
Standby Letters of Credit | Revolving Credit Facility | Bank of America 2018 Credit Agreement | Bank of America                
Short-term Debt [Line Items]                
Credit facility, maximum borrowing capacity     $ 6,400,000       $ 3,200,000