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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

X

- 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

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X

- 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
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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