INCOME TAXES - Summary of Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Deferred tax assets:
Accrued expenses	$ 4,883	$ 6,734
Deferred revenue	8,427	13,913
Reserves	6,240	7,916
Pension and other retiree benefits	4,978	4,842
Net operating loss carryforwards	27,322	41,225
Tax credit carryforwards	5,502	5,824
Share-based compensation	6,418	4,975
Other	288	426
Total gross deferred tax assets	64,058	85,855
Valuation allowance	(3,374)	(3,777)
Net deferred tax assets	60,684	82,078
Deferred tax liabilities:
Intangible assets	(323,008)	(354,601)
Depreciation	(8,695)	(6,630)
Total deferred tax liability	$ (271,019)	$ (279,153)