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FINANCING ARRANGEMENTS - Revolving Credit Facility (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Debt Instrument [Line Items]              
Cash and cash equivalents     $ 113,667,000 $ 113,667,000 $ 70,141,000    
Long-term debt     177,500,000 177,500,000 90,000,000    
Repayments of revolving credit facility       125,500,000 0 $ 124,230,000  
Cash, cash equivalent and restricted cash     122,880,000 122,880,000 92,379,000 148,775,000 $ 209,986,000
Current liabilities     237,014,000 237,014,000 128,283,000    
Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Cash and cash equivalents     113,700,000 113,700,000      
Long-term debt     177,500,000 177,500,000 $ 90,000,000    
Maximum borrowing capacity     295,000,000.0 295,000,000.0      
Revolving credit facility remaining borrowing capacity     96,500,000 96,500,000      
Proceeds from lines of credit   $ 183,000,000.0       $ 90,000,000.0  
Repayments of revolving credit facility     125,500,000        
Minimum liquidity $ 75,000,000.0            
Line of Credit | Standby Letters of Credit              
Debt Instrument [Line Items]              
Long-term line of credit     $ 21,000,000.0 $ 21,000,000.0      
Minimum | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Facility fee 0.50%            
Maximum | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Facility fee 0.75%            
LIBOR floor | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Basis spread (as a percent) 1.25%            
LIBOR | Minimum | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Basis spread (as a percent) 3.75%            
LIBOR | Maximum | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Basis spread (as a percent) 4.25%            
Base rate | Minimum | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Basis spread (as a percent) 2.75%            
Base rate | Maximum | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Basis spread (as a percent) 3.25%