BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details)	12 Months Ended
Mar. 31, 2020 USD ($) unit segment	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Goodwill [Line Items]
Number of operating segments \| segment	1
Number of reportable segments \| segment	1
Number of reporting units \| unit	2
Goodwill and intangible asset impairment	$ 0	$ 0	$ 0
Goodwill	$ 386,494,000	$ 381,717,000	$ 399,530,000
Estimated service period minimum	6 months
Estimated service period maximum	15 months
Reporting unit
Goodwill [Line Items]
Goodwill	$ 152,175,000

Estimated Service Period Maximum

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Estimated Service Period Minimum

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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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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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