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, 2025	Mar. 31, 2025
Fair value of assets and liabilities
Cash and Cash Equivalents	$ 369,446	$ 413,331
Short-Term Investments	7,500	7,500
Other Current Assets	18,147	16,359
Total assets	395,093	437,190
Cash
Fair value of assets and liabilities
Other Current Assets	0	0
Cash
Fair value of assets and liabilities
Short-Term Investments	0	0
Cash
Fair value of assets and liabilities
Cash and Cash Equivalents	33,003	25,402
Total assets	33,003	25,402
Level 1: | Money market funds
Fair value of assets and liabilities
Other Current Assets	0	0
Level 1: | Assets of non-qualified retirement plan
Fair value of assets and liabilities
Other Current Assets	17,748	15,913
Level 1: | Certificates of deposit
Fair value of assets and liabilities
Other Current Assets	0	0
Level 1: | Equity securities
Fair value of assets and liabilities
Other Current Assets	399	446
Level 1: | Money market funds
Fair value of assets and liabilities
Short-Term Investments	0	0
Level 1: | Assets of non-qualified retirement plan
Fair value of assets and liabilities
Short-Term Investments	0	0
Level 1: | Certificates of deposit
Fair value of assets and liabilities
Short-Term Investments	7,500	7,500
Level 1: | Equity securities
Fair value of assets and liabilities
Short-Term Investments	0	0
Level 1: | Money market funds
Fair value of assets and liabilities
Cash and Cash Equivalents	336,443	387,929
Total assets	336,443	387,929
Level 1: | Assets of non-qualified retirement plan
Fair value of assets and liabilities
Cash and Cash Equivalents	0	0
Total assets	17,748	15,913
Level 1: | Certificates of deposit
Fair value of assets and liabilities
Cash and Cash Equivalents	0	0
Total assets	7,500	7,500
Level 1: | Equity securities
Fair value of assets and liabilities
Cash and Cash Equivalents	0	0
Total assets	$ 399	$ 446