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Debt and Financing Arrangements (Details) - USD ($)
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Line of Credit Facility [Line Items]      
Standby letters of credit outstanding $ 4,800,000    
Revolving Credit Facility | Line of Credit | Amended Credit Agreement      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   $ 250,000,000.0  
Commitment fee percentage   0.375%  
Commitment fees incurred 900,000 $ 300,000 $ 200,000
Debt issuance costs   $ 900,000  
Covenant, minimum level of liquidity required 125,000,000.0    
Revolving Credit Facility | Line of Credit | Amended Credit Agreement | Minimum      
Line of Credit Facility [Line Items]      
Covenant, minimum level of revenue required 725,000,000.0    
Revolving Credit Facility | Line of Credit | Amended Credit Agreement | Maximum      
Line of Credit Facility [Line Items]      
Covenant, minimum level of revenue required $ 1,985,000,000.0    
Revolving Credit Facility | Line of Credit | Amended Credit Agreement | LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   2.75%  
Revolving Credit Facility | Line of Credit | Amended Credit Agreement | Alternative Base Rate      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   1.75%  
Letter of Credit | Line of Credit | Amended Credit Agreement      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity (or less)   $ 150,000,000.0