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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Effective Income Tax Rate Reconciliation, Amount
Federal income tax provision computed at statutory rate		$ 85,937	$ 49,486	$ 47,107
State and local taxes, net of federal tax effect		18,877	10,819	12,944
Tax impact from foreign operations		(1,036)	(1,083)	(2,098)
Nondeductible expenses		6,004	4,721	3,797
Stock compensation		(13,349)	(7,269)	(8)
Uncertain tax positions, true-up items, and other		24	(4,820)	2,159
Enactment of the Tax Act		0	0	1,313
Total	$ 65,214	$ 96,457	$ 51,854	$ 65,214
Effective Income Tax Rate Reconciliation, Percent
Federal income tax provision computed at statutory rate		21.00%	21.00%	21.00%
State and local taxes, net of federal tax effect		4.60%	4.60%	5.80%
Tax impact from foreign operations		(0.20%)	(0.50%)	(0.90%)
Nondeductible expenses		1.50%	2.00%	1.70%
Stock compensation		(3.30%)	(3.10%)	0.00%
Uncertain tax positions, true-up items, and other		0.00%	(2.00%)	0.90%
Enactment of the Tax Act		0.00%	0.00%	0.60%
Total	29.10%	23.60%	22.00%	29.10%

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