INCOME TAXES - Schedule of Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Deferred tax assets:
Accrued expenses	$ 5,056	$ 4,986
Capitalized R&D expenses	92,427	71,205
Deferred revenue	20,356	21,482
Reserves	2,378	2,650
Pension and other retiree benefits	2,265	2,733
Net operating loss carryforwards	6,532	8,199
Tax credit carryforwards	32,042	29,109
Share-based compensation	7,140	8,233
Operating lease liability	10,503	12,292
Total gross deferred tax assets	178,699	160,889
Valuation allowance	(23,088)	(21,183)
Net deferred tax assets	155,611	139,706
Deferred tax liabilities:
Intangible assets	(65,979)	(86,170)
Operating lease right-of-use asset	(9,067)	(10,481)
Depreciation	(2,494)	(3,472)
Other deferred tax liabilities	(14,420)	(13,190)
Total deferred tax assets	$ 63,651	$ 26,393