BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - WHOLLY OWNED LABELS (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) label	Jun. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Wholly-owned labels | label	2
Income from operations	$ 60,276	$ (38,567)
Grand Theft Auto
Finite-Lived Intangible Assets [Line Items]
Estimated service period	50 months		41 months
Scenario, Adjustment | Grand Theft Auto
Finite-Lived Intangible Assets [Line Items]
Revenues	$ (25,683)
Income from operations	$ (23,731)
Accounting Standards Update 2016-09 | Scenario, Adjustment
Finite-Lived Intangible Assets [Line Items]
Deferred tax assets, net			$ 24,594
Retained Earnings | Accounting Standards Update 2016-09, Forfeiture Rate Component
Finite-Lived Intangible Assets [Line Items]
Cumulative effect of new accounting principle			(323)
Additional Paid-in Capital | Accounting Standards Update 2016-09, Forfeiture Rate Component
Finite-Lived Intangible Assets [Line Items]
Cumulative effect of new accounting principle			$ 323