FAIR VALUE MEASUREMENTS - Schedule of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
ASSETS:
Cash and cash equivalents	$ 467,176	$ 338,489
Available for sale securities	9,277	50,582
Derivative financial instruments	57
Total assets	476,510	389,071
LIABILITIES:
Contingent purchase consideration		(1,748)
Derivative financial instruments	(191)	(49)
Total liabilities	(191)	(1,797)
U.S. government and municipal obligations
ASSETS:
Available for sale securities	3,578	31,341
Commercial paper
ASSETS:
Available for sale securities	5,699	14,644
Corporate bonds
ASSETS:
Available for sale securities		4,597
Level 1
ASSETS:
Cash and cash equivalents	467,176	338,489
Derivative financial instruments	0
Total assets	469,715	374,427
LIABILITIES:
Contingent purchase consideration		0
Derivative financial instruments	0	0
Total liabilities	0	0
Level 1 \| U.S. government and municipal obligations
ASSETS:
Available for sale securities	2,539	31,341
Level 1 \| Commercial paper
ASSETS:
Available for sale securities	0	0
Level 1 \| Corporate bonds
ASSETS:
Available for sale securities		4,597
Level 2
ASSETS:
Cash and cash equivalents	0	0
Derivative financial instruments	57
Total assets	6,795	14,644
LIABILITIES:
Contingent purchase consideration		0
Derivative financial instruments	(191)	(49)
Total liabilities	(191)	(49)
Level 2 \| U.S. government and municipal obligations
ASSETS:
Available for sale securities	1,039	0
Level 2 \| Commercial paper
ASSETS:
Available for sale securities	5,699	14,644
Level 2 \| Corporate bonds
ASSETS:
Available for sale securities		0
Level 3
ASSETS:
Cash and cash equivalents	0	0
Derivative financial instruments	0
Total assets	0	0
LIABILITIES:
Contingent purchase consideration		(1,748)
Derivative financial instruments	0	0
Total liabilities	0	(1,748)
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

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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