FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS - OPTION TO ACQUIRE NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Jan. 31, 2020
Changes in the estimated fair value of liability for contingent consideration measured using significant unobservable inputs (Level 3)
Change in fair value, recorded in operating expenses	$ 4,800	$ (1,200)
Contingent consideration \| Minimum
Liability for contingent consideration measured using significant unobservable inputs (Level 3)
Fair Value Measurement Input - Discount Rate	6.40%		4.30%
Contingent consideration \| Maximum
Liability for contingent consideration measured using significant unobservable inputs (Level 3)
Fair Value Measurement Input - Discount Rate	6.80%		4.90%
Option to Acquire Noncontrolling Interests
Liability for contingent consideration measured using significant unobservable inputs (Level 3)
Fair Value Measurement Input - Discount Rate	11.00%		9.00%
Changes in the estimated fair value of liability for contingent consideration measured using significant unobservable inputs (Level 3)
Fair value measurement at the beginning of the period	$ 2,900	3,000	$ 3,000
Change in fair value, recorded in operating expenses	(250)	(150)
Fair value measurement at the end of the period	$ 2,650	$ 2,850	$ 2,900

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

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

No definition available.

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