DEBT - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Oct. 11, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 550.0	$ 550.0
Letters of Credit Outstanding, Amount	68.5	$ 68.5			$ 0.1	$ 0.1
Line Of Credit Facility Unused Capacity Commitment Fee Percentage		0.35%
Line of Credit Facility, Current Borrowing Capacity	$ 400.0	$ 400.0
Letter of Credit Annual Fee Percentage	2.00%	2.00%
Line of Credit Facility, Expiration Date		Mar. 31, 2020
Foreign Currency Borrowing Capacity	$ 200.0	$ 200.0
Line of Credit Facility, Initiation Date		Mar. 31, 2015
Long-term Line of Credit	$ 225.0	$ 225.0
Debt, Weighted Average Interest Rate	2.73%	2.73%
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 | 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
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 100.0	$ 50.0
Letter Of Credit Title IV Disbursement, Amount	$ 68.4	$ 68.4