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Bank Loan (Details) - USD ($)
12 Months Ended
Aug. 25, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 02, 2015
Line of Credit Facility        
Line of Credit Facility, Revolving Loan Commitment, Accordion Feature       $ 50,000,000
Short-term borrowings under revolving credit facility   $ 89,787,000 $ 27,621,000  
Revolving Credit Facility        
Line of Credit Facility        
Line of credit, current borrowing capacity   117,100,000    
Short-term borrowings under revolving credit facility   89,787,000    
Line of credit, remaining borrowing capacity   $ 25,300,000    
Debt, weighted average interest rate   4.10%    
Letter of Credit        
Line of Credit Facility        
Long-term borrowings under revolving credit facility   $ 2,000,000    
Loan and Security Agreement [Member] | Revolving Credit Facility | Minimum        
Line of Credit Facility        
Line of Credit Facility, Commitment Fee Percentage   0.25%    
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%    
JP Morgan and SunTrust [Member] | Loan and Security Agreement [Member] | Revolving Credit Facility        
Line of Credit Facility        
Line of credit, maximum borrowing capacity   $ 125,000,000    
JP Morgan and SunTrust [Member] | Loan and Security Agreement [Member] | Letter of Credit        
Line of Credit Facility        
Line of credit, maximum borrowing capacity       30,000,000
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
Prime Rate | Loan and Security Agreement [Member] | Minimum        
Line of Credit Facility        
Line of credit, description of interest rate PRIME - 0.25%      
Prime Rate | Loan and Security Agreement [Member] | Maximum        
Line of Credit Facility        
Line of credit, description of interest rate PRIME + 0.50%      
London Interbank Offered Rate (LIBOR) | Loan and Security Agreement [Member] | Minimum        
Line of Credit Facility        
Line of credit, description of interest rate Adjusted LIBO Rate + 1.25%      
London Interbank Offered Rate (LIBOR) | Loan and Security Agreement [Member] | Maximum        
Line of Credit Facility        
Line of credit, description of interest rate Adjusted LIBO Rate + 2.00%