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Debt - Narrative (Details)
12 Months Ended
Mar. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Long-term debt outstanding        
Aggregate maturities of long-term debt, 2018   $ 55,000,000    
Aggregate maturities of long-term debt, 2019   0    
Aggregate maturities of long-term debt, 2020   0    
Aggregate maturities of long-term debt, 2021   0    
Aggregate maturities of long-term debt, 2022   250,000,000    
Aggregate maturities of long-term debt, thereafter   300,000,000    
Interest costs   31,100,000 $ 29,900,000 $ 30,400,000
Interest costs, capitalized   1,300,000 $ 1,900,000 $ 2,700,000
Credit Agreement        
Long-term debt outstanding        
Maximum borrowing capacity $ 400,000,000.0      
Letters of credit issued   6,100,000    
Credit Agreement available for future borrowings   $ 393,900,000    
Credit Agreement | LIBOR        
Long-term debt outstanding        
Interest rate margin   1.50%    
Credit Agreement | LIBOR | Minimum        
Long-term debt outstanding        
Interest rate margin 1.00%      
Credit Agreement | LIBOR | Maximum        
Long-term debt outstanding        
Interest rate margin 1.75%      
Credit Agreement | Base Rate        
Long-term debt outstanding        
Interest rate margin   0.50%    
Credit Agreement | Base Rate | Minimum        
Long-term debt outstanding        
Interest rate margin 0.00%      
Credit Agreement | Base Rate | Maximum        
Long-term debt outstanding        
Interest rate margin 0.75%      
Letter of Credit        
Long-term debt outstanding        
Commitment fee rate   0.275%    
Letter of credit fees   1.50%    
Required interest coverage ratio 3.50      
Letter of Credit | Minimum        
Long-term debt outstanding        
Commitment fee rate 0.125%      
Letter of credit fees 1.00%      
Letter of Credit | Maximum        
Long-term debt outstanding        
Commitment fee rate 0.40%      
Letter of credit fees 1.75%      
Required debt to capital ratio 0.55