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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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