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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 08, 2016
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2015
Subsequent Event [Line Items]            
Maximum borrowing capacity   $ 120,000,000   $ 120,000,000   $ 120,000,000
Maximum borrowing capacity on obtaining consent of the issuing bank   200,000,000   200,000,000   200,000,000
Line of credit facility, amount outstanding   0   0   $ 0
Standby letters of credit, amount outstanding   4,700,000   4,700,000    
Interest paid   $ 0 $ 0 $ 0 $ 0  
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Maximum borrowing capacity $ 150,000,000          
Maximum borrowing capacity on obtaining consent of the issuing bank $ 225,000,000          
Line of credit facility, expiration date Apr. 08, 2021          
Minimum interest coverage ratio 250.00%          
Maximum leverage ratio 300.00%