INCOME TAXES - Summary of Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Deferred tax assets:
Accrued expenses	$ 4,359	$ 4,068
Deferred revenue	11,278	12,168
Reserves	5,463	3,375
Pension and other retiree benefits	5,960	5,307
Net operating loss carryforwards	14,992	21,251
Tax credit carryforwards	9,043	6,625
Share-based compensation	5,505	5,164
Other	166	418
Total gross deferred tax assets	56,766	58,376
Valuation allowance	(835)	(3,108)
Net deferred tax assets	55,931	55,268
Deferred tax liabilities:
Intangible assets	(164,199)	(195,959)
Other Deferred Liabilities	(1,609)	0
Depreciation	(7,134)	(4,187)
Total deferred tax asset (liability)	$ (117,011)	$ (144,878)