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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Provision for income taxes |  |  | $ 65,214 | $ 96,457 | $ 51,854 | $ 65,214
Effective tax rate |  |  | 29.10% | 23.60% | 22.00% | 29.10%
Federal corporate rate |  |  |  | 21.00% | 21.00% | 21.00%
Deferred tax asset, foreign net operating losses | $ 5,616 |  |  | $ 5,616 |  |
Deferred tax assets, valuation allowance | 7,308 |  |  | 7,308 | $ 8,619 |
Decrease in deferred tax assets valuation allowance |  | $ 272 |  | 1,314 |  |
Cash in certain foreign jurisdictions in excess of near-term working capital needs | 39,000 |  |  | 39,000 |  |
Recorded liabilities for interest and penalties related to uncertain tax positions | 1,984 |  |  | 1,984 | 1,845 |
Unrecognized tax benefits | 14,666 |  |  | 14,666 | 9,947 | $ 4,960
Reasonably possible decrease in gross unrecognized income tax benefits for federal and state items may be necessary within the next 12 months | 1,300 |  |  | 1,300 |  |
Release of reserves relating to the lapse of the statute of limitations | 1,800 |  |  |  |  |
Foreign Tax Authority |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Tax credit carryforward, amount | $ 2,475 |  |  | $ 2,475 | $ 2,478 |

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