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DEBT - Additional Information (Detail) - USD ($)
$ in Millions
 9 Months Ended
Apr. 13, 2018
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Oct. 04, 2016
Subsequent Event [Member]          
Line of Credit Facility [Line Items]          
Letters of Credit Outstanding, Amount $ 68.4        
Line of Credit Facility, Current Borrowing Capacity $ 300.0        
Line of Credit Facility, Expiration Date Apr. 13, 2023        
Debt Instrument, Maturity Date Apr. 13, 2025        
Proceeds from Issuance of Senior Long-term Debt $ 300.0        
Repayments of Lines of Credit 140.0        
Payment Of Tansaction Costs, Line Of Credit 8.4        
Line of Credit Facility, Remaining Borrowing Capacity 231.6        
Secured Debt 300.0        
Amount Borrowed For General Corporate Purposes $ 151.6        
Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 550.0      
Letters of Credit Outstanding, Amount   $ 68.4 $ 68.5 $ 68.5  
Line Of Credit Facility Unused Capacity Commitment Fee Percentage   0.35%      
Line of Credit Facility, Current Borrowing Capacity   $ 400.0      
Letter of Credit Annual Fee Percentage   2.00%      
Foreign Currency Borrowing Capacity   $ 200.0      
Line of Credit Facility, Initiation Date   Mar. 31, 2015      
Long-term Line of Credit   $ 120.0 $ 125.0 $ 120.0  
Debt, Weighted Average Interest Rate   3.70% 3.18% 3.45%  
Revolving Credit Facility | Minimum [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Interest Rate During Period   1.00%      
Revolving Credit Facility | Maximum [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Interest Rate During Period   2.00%      
Revolving Credit Facility | ED Settlement [Member]          
Line of Credit Facility [Line Items]          
Letters of Credit Outstanding, Amount   $ 68.4      
Revolving Credit Facility | Prime Rate | Minimum [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Interest Rate During Period   2.00%      
Revolving Credit Facility | Prime Rate | Maximum [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Interest Rate During Period   3.00%      
Letter of Credit [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity         $ 50.0
Letter of Credit [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity         $ 100.0