FAIR VALUE MEASUREMENTS - Schedule of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
ASSETS:
Cash and cash equivalents	$ 297,655	$ 386,794
Available-for-sale securities	24,497	41,144
Equity investment in Napatech	7,970
Derivative financial instruments	67	59
Total assets	330,189	427,997
LIABILITIES:
Derivative financial instruments	(12)	(1,429)
Total liabilities	(12)	(1,429)
U.S. government and municipal obligations
ASSETS:
Available-for-sale securities	11,974	17,735
Commercial paper
ASSETS:
Available-for-sale securities	8,668	19,136
Corporate bonds
ASSETS:
Available-for-sale securities		310
Certificate of deposits
ASSETS:
Available-for-sale securities	3,855	3,963
Level 1
ASSETS:
Cash and cash equivalents	296,144	370,455
Equity investment in Napatech	7,970
Derivative financial instruments	0	0
Total assets	316,088	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	11,974	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 | Certificate of deposits
ASSETS:
Available-for-sale securities	0	0
Level 2
ASSETS:
Cash and cash equivalents	1,511	16,339
Equity investment in Napatech	0
Derivative financial instruments	67	59
Total assets	14,101	39,497
LIABILITIES:
Derivative financial instruments	(12)	(49)
Total liabilities	(12)	(49)
Level 2 | U.S. government and municipal obligations
ASSETS:
Available-for-sale securities	0	0
Level 2 | Commercial paper
ASSETS:
Available-for-sale securities	8,668	19,136
Level 2 | Corporate bonds
ASSETS:
Available-for-sale securities		0
Level 2 | Certificate of deposits
ASSETS:
Available-for-sale securities	3,855	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 | Certificate of deposits
ASSETS:
Available-for-sale securities	$ 0	$ 0