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SEGMENT AND GEOGRAPHICAL INFORMATION - Revenue and Assets by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 1,525,452 | $ 1,159,368 | $ 1,084,385
Segment profit | 521,370 | 322,546 | 305,986
Corporate expenses (2) | (1,117,295) | (929,767) | (865,288)
Other (income)/expense, net | 1,071 | 6,046 | 5,223
Income before provision for income taxes | 409,228 | 235,647 | 224,320
Assets | 2,426,067 | 1,677,003 | 1,425,912
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 893,241 | 717,005 | 716,036
Operating Segments | Corporate Finance |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 802,853 | 646,788 | 607,333
Segment profit | 250,513 | 179,660 | 193,603
Assets | 575,241 | 403,147 | 403,928
Operating Segments | Financial Restructuring |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 534,747 | 352,517 | 317,774
Segment profit | 224,215 | 107,714 | 83,607
Assets | 181,239 | 186,418 | 184,364
Operating Segments | Financial and Valuation Advisory |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 187,852 | 160,063 | 159,278
Segment profit | 46,642 | 35,172 | 28,776
Assets | 136,761 | 127,440 | 127,744
Corporate, Non-Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Corporate expenses (2) | (113,213) | (92,945) | (86,889)
Assets | $ 1,532,826 | $ 959,998 | 709,876
Segment Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Other (income)/expense, net |  |  | $ (5,223)

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