FAIR VALUE MEASUREMENTS - Schedule of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
ASSETS:
Cash and cash equivalents	$ 457,415	$ 389,674
Available for sale securities	23,281	22,946
Equity investment in Napatech	11,781	11,507
Derivative financial instruments	197	11
Total assets	492,674	424,138
LIABILITIES:
Derivative financial instruments	(55)	(74)
Total liabilities	(55)	(74)
U.S. government and municipal obligations
ASSETS:
Available for sale securities	5,418	11,491
Commercial paper
ASSETS:
Available for sale securities	17,358	8,648
Certificates of deposit
ASSETS:
Available for sale securities	505	2,807
Level 1
ASSETS:
Cash and cash equivalents	434,121	381,829
Equity investment in Napatech	11,781	11,507
Derivative financial instruments	0	0
Total assets	448,910	402,321
LIABILITIES:
Derivative financial instruments	0	0
Total liabilities	0	0
Level 1 | U.S. government and municipal obligations
ASSETS:
Available for sale securities	3,008	8,985
Level 1 | Commercial paper
ASSETS:
Available for sale securities	0	0
Level 1 | Certificates of deposit
ASSETS:
Available for sale securities	0	0
Level 2
ASSETS:
Cash and cash equivalents	23,294	7,845
Equity investment in Napatech	0	0
Derivative financial instruments	197	11
Total assets	43,764	21,817
LIABILITIES:
Derivative financial instruments	(55)	(74)
Total liabilities	(55)	(74)
Level 2 | U.S. government and municipal obligations
ASSETS:
Available for sale securities	2,410	2,506
Level 2 | Commercial paper
ASSETS:
Available for sale securities	17,358	8,648
Level 2 | Certificates of deposit
ASSETS:
Available for sale securities	505	2,807
Level 3
ASSETS:
Cash and cash equivalents	0	0
Equity investment in Napatech	0	0
Derivative financial instruments	0	0
Total assets	0	0
LIABILITIES:
Derivative financial instruments	0	0
Total liabilities	0	0
Level 3 | U.S. government and municipal obligations
ASSETS:
Available for sale securities	0	0
Level 3 | Commercial paper
ASSETS:
Available for sale securities	0	0
Level 3 | Certificates of deposit
ASSETS:
Available for sale securities	$ 0	$ 0