FAIR VALUE MEASUREMENTS - Schedule of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
ASSETS:
Cash and cash equivalents	$ 389,674	$ 386,794
Available for sale securities	22,946	41,144
Equity investment in Napatech	11,507
Derivative financial instruments	11	59
Total assets	424,138	427,997
LIABILITIES:
Derivative financial instruments	(74)	(1,429)
Total liabilities	(74)	(1,429)
U.S. government and municipal obligations
ASSETS:
Available for sale securities	11,491	17,735
Commercial paper
ASSETS:
Available for sale securities	8,648	19,136
Corporate bonds
ASSETS:
Available for sale securities		310
Certificates of deposit
ASSETS:
Available for sale securities	2,807	3,963
Level 1
ASSETS:
Cash and cash equivalents	381,829	370,455
Equity investment in Napatech	11,507
Derivative financial instruments	0	0
Total assets	402,321	388,500
LIABILITIES:
Derivative financial instruments	0	0
Total liabilities	0	0
Level 1 | U.S. government and municipal obligations
ASSETS:
Available for sale securities	8,985	17,735
Level 1 | Commercial paper
ASSETS:
Available for sale securities	0	0
Level 1 | Corporate bonds
ASSETS:
Available for sale securities		310
Level 1 | Certificates of deposit
ASSETS:
Available for sale securities	0	0
Level 2
ASSETS:
Cash and cash equivalents	7,845	16,339
Equity investment in Napatech	0
Derivative financial instruments	11	59
Total assets	21,817	39,497
LIABILITIES:
Derivative financial instruments	(74)	(49)
Total liabilities	(74)	(49)
Level 2 | U.S. government and municipal obligations
ASSETS:
Available for sale securities	2,506	0
Level 2 | Commercial paper
ASSETS:
Available for sale securities	8,648	19,136
Level 2 | Corporate bonds
ASSETS:
Available for sale securities		0
Level 2 | Certificates of deposit
ASSETS:
Available for sale securities	2,807	3,963
Level 3
ASSETS:
Cash and cash equivalents	0	0
Equity investment in Napatech	0
Derivative financial instruments	0	0
Total assets	0	0
LIABILITIES:
Derivative financial instruments	0	(1,380)
Total liabilities	0	(1,380)
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 | Corporate bonds
ASSETS:
Available for sale securities		0
Level 3 | Certificates of deposit
ASSETS:
Available for sale securities	$ 0	$ 0