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INCOME TAXES - Reconciliation of Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense computed at U.S. federal statutory rate	$ 126,981	$ 139,112	$ 121,681
Increases (reductions) resulting from:
State and local income taxes, net of federal tax	28,762	17,586	20,031
Foreign income taxes, net of federal tax	9,243	6,679	12,344
Meals and entertainment	343	653	1,761
Re-measurement of current year losses under CARES Act	0	(76,767)	0
Excess tax benefits from stock-based compensation	(4,227)	(8,556)	(10,265)
Research and development and other federal credits	(34,080)	(30,313)	(90,898)
Executive compensation -162(m)	3,614	3,813	2,346
Foreign-Derived Intangible Income (FDII)	(9,115)	(4,536)	(4,915)
Changes in uncertain tax positions	16,938	6,793	44,621
Other	(993)	(983)	125
Total	$ 137,466	$ 53,481	$ 96,831

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