LONG TERM DEBT - Summary of long-term debt (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Jun. 30, 2015
Debt Instrument [Line Items]
Principal amount of long-term debt		$ 1,472,833	$ 1,074,297
Less unamortized debt issuance costs	[1]	(16,789)	(10,733)
Total long-term debt		1,456,044	1,063,564
Less current portion		(53,965)	(38,965)
Long-term debt, net of current portion		1,402,079	1,024,599
Bank credit facility - term loans
Debt Instrument [Line Items]
Principal amount of long-term debt		1,032,833	779,297
Bank credit facility - revolver loans
Debt Instrument [Line Items]
Principal amount of long-term debt		$ 440,000	$ 295,000

[1] Balance as of June 30, 2015 has been adjusted for the reclassification of debt issuance costs related to the adoption of ASU 2015-03. See Note 3 for additional information.