INCOME TAXES - Summary of Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Deferred tax assets:
Accrued expenses	$ 8,480	$ 5,060
Deferred revenue	17,648	14,420
Reserves	2,898	3,216
Pension and other retiree benefits	6,160	5,078
Net operating loss carryforwards	11,526	12,443
Tax credit carryforwards	19,432	14,138
Share-based compensation	5,397	4,534
Operating lease liability	17,333	18,213
Other deferred tax assets	2,116	20
Total gross deferred tax assets	90,990	77,122
Valuation allowance	(11,406)	(5,641)
Net deferred tax assets	79,584	71,481
Deferred tax liabilities:
Intangible assets	(132,635)	(146,950)
Other deferred tax liabilities	(8,848)	(8,061)
Operating lease right-of-use asset	(14,474)	(15,152)
Depreciation	(7,818)	(9,492)
Total deferred tax liability	$ (84,191)	$ (108,174)