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Revolving Credit Facility (Details) - USD ($)
3 Months Ended 12 Months Ended
Nov. 06, 2018
Aug. 25, 2017
Sep. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Oct. 18, 2018
Line of Credit Facility            
Long-term borrowings under revolving credit facility       $ 92,000,000 $ 0  
Revolving Credit Facility            
Line of Credit Facility            
Line of credit, current borrowing capacity       $ 150,000,000    
Debt, weighted average interest rate       3.98% 4.10%  
Letter of Credit            
Line of Credit Facility            
Long-term borrowings under revolving credit facility       $ 2,300,000    
Loan and Security Agreement [Member] | Option One | Revolving Credit Facility            
Line of Credit Facility            
Description of variable rate basis       Prime Rate    
Loan and Security Agreement [Member] | Option One | Revolving Credit Facility | Minimum            
Line of Credit Facility            
Basis spread on variable rate       (0.25%)    
Loan and Security Agreement [Member] | Option One | Revolving Credit Facility | Maximum            
Line of Credit Facility            
Basis spread on variable rate       0.50%    
Loan and Security Agreement [Member] | Option Two | Revolving Credit Facility            
Line of Credit Facility            
Description of variable rate basis       LIBOR Rate    
Loan and Security Agreement [Member] | Option Two | Revolving Credit Facility | Minimum            
Line of Credit Facility            
Basis spread on variable rate       1.25%    
Loan and Security Agreement [Member] | Option Two | Revolving Credit Facility | Maximum            
Line of Credit Facility            
Basis spread on variable rate       2.00%    
Amended Credit Agreement [Member] | Revolving Credit Facility            
Line of Credit Facility            
Line of Credit Facility, Commitment Fee Percentage   0.25%        
JP Morgan and SunTrust [Member] | Minimum            
Line of Credit Facility            
Debt Instrument, Interest Rate, Increase (Decrease)     0.375%      
JP Morgan and SunTrust [Member] | Maximum            
Line of Credit Facility            
Debt Instrument, Interest Rate, Increase (Decrease)     0.50%      
JP Morgan and SunTrust [Member] | Loan and Security Agreement [Member] | Revolving Credit Facility            
Line of Credit Facility            
Line of Credit Facility, Revolving Loan Commitment, Accordion Feature       $ 10,000,000    
JP Morgan and SunTrust [Member] | Amended Credit Agreement [Member] | Revolving Credit Facility            
Line of Credit Facility            
Line of credit, maximum borrowing capacity       $ 125,000,000   $ 135,000,000
JP Morgan Chase [Member] | Loan and Security Agreement [Member] | Revolving Credit Facility            
Line of Credit Facility            
Line of credit, maximum borrowing capacity $ 150,000,000          
Line of Credit Facility, Revolving Loan Commitment, Accordion Feature 75,000,000          
JP Morgan Chase [Member] | Loan and Security Agreement [Member] | Swing Line Loans            
Line of Credit Facility            
Line of credit, maximum borrowing capacity $ 15,000,000          
JP Morgan Chase [Member] | Amended Credit Agreement [Member] | Revolving Credit Facility | Minimum            
Line of Credit Facility            
Line of Credit Facility, Commitment Fee Percentage 0.20%          
JP Morgan Chase [Member] | Amended Credit Agreement [Member] | Revolving Credit Facility | Maximum            
Line of Credit Facility            
Line of Credit Facility, Commitment Fee Percentage 0.40%          
Prime Rate | JP Morgan and SunTrust [Member]            
Line of Credit Facility            
Line of credit, description of interest rate       PRIME + 0.25%    
Prime Rate | JP Morgan and SunTrust [Member] | Minimum            
Line of Credit Facility            
Line of credit, description of interest rate         PRIME - 0.25%  
Prime Rate | JP Morgan and SunTrust [Member] | Maximum            
Line of Credit Facility            
Line of credit, description of interest rate         PRIME + 0.50%  
Prime Rate | JP Morgan Chase [Member] | Minimum            
Line of Credit Facility            
Line of credit, description of interest rate       PRIME + 0.25%    
Prime Rate | JP Morgan Chase [Member] | Maximum            
Line of Credit Facility            
Line of credit, description of interest rate       PRIME + 0.875%    
London Interbank Offered Rate (LIBOR) | JP Morgan and SunTrust [Member]            
Line of Credit Facility            
Line of credit, description of interest rate       Adjusted LIBO Rate + 1.75%    
London Interbank Offered Rate (LIBOR) | JP Morgan and SunTrust [Member] | Minimum            
Line of Credit Facility            
Line of credit, description of interest rate         Adjusted LIBO Rate + 1.25%  
London Interbank Offered Rate (LIBOR) | JP Morgan and SunTrust [Member] | Maximum            
Line of Credit Facility            
Line of credit, description of interest rate         Adjusted LIBO Rate + 2.00%  
London Interbank Offered Rate (LIBOR) | JP Morgan Chase [Member] | Minimum            
Line of Credit Facility            
Line of credit, description of interest rate       Adjusted LIBO Rate + 1.25%    
London Interbank Offered Rate (LIBOR) | JP Morgan Chase [Member] | Maximum            
Line of Credit Facility            
Line of credit, description of interest rate       Adjusted LIBO Rate + 1.875%    
Interest Rate Swap [Member]            
Line of Credit Facility            
Derivative, Notional Amount       $ 80,000,000    
Derivative, Floor Interest Rate       0.00%    
Derivative, Fixed Interest Rate       2.1975%