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GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill by Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021
Goodwill |  |
April 1, 2020 |  | $ 618,455
Changes |  | 52,610
March 31, 2020 | $ 671,065 | 671,065
Corporate Finance |  |
Goodwill |  |
April 1, 2020 |  | 363,925
Changes | 52,610 |
March 31, 2020 | 416,535 | 416,535
Financial Restructuring |  |
Goodwill |  |
April 1, 2020 |  | 162,815
Changes | 0 |
March 31, 2020 | 162,815 | 162,815
Financial and Valuation Advisory |  |
Goodwill |  |
April 1, 2020 |  | 91,715
Changes | 0 |
March 31, 2020 | $ 91,715 | $ 91,715

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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