FAIR VALUE OF FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements within the Fair Value Hierarchy (Details) - Fair value measurements on recurring basis - USD ($) $ in Thousands	Sep. 30, 2024	Mar. 31, 2024
Fair value of assets and liabilities
Cash and Cash Equivalents	$ 338,946	$ 336,867
Short-Term Investments	9,494	32,045
Other Current Assets	16,498	14,284
Total assets	364,938	383,196
Cash
Fair value of assets and liabilities
Cash and Cash Equivalents	25,695	33,224
Short-Term Investments	0	0
Other Current Assets	0	0
Total assets	25,695	33,224
Level 1: | Money market funds
Fair value of assets and liabilities
Cash and Cash Equivalents	313,251	303,643
Short-Term Investments	0	0
Other Current Assets	0	0
Total assets	313,251	303,643
Level 1: | Assets of non-qualified retirement plan
Fair value of assets and liabilities
Cash and Cash Equivalents	0	0
Short-Term Investments	0	0
Other Current Assets	16,498	14,284
Total assets	16,498	14,284
Level 1: | U.S. Treasury securities
Fair value of assets and liabilities
Cash and Cash Equivalents	0	0
Short-Term Investments	1,994	24,545
Other Current Assets	0	0
Total assets	1,994	24,545
Level 1: | Certificates of deposit
Fair value of assets and liabilities
Cash and Cash Equivalents	0	0
Short-Term Investments	7,500	7,500
Other Current Assets	0	0
Total assets	$ 7,500	$ 7,500