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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - $ / shares	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Restricted Stock Units (RSUs)
Awards Outstanding
Unvested, beginning balance	242,943	281,825	327,014
Granted	1,280,664	142,594	137,723
Vested	(107,917)	(168,781)	(159,663)
Canceled	(22,422)	(12,695)	(23,249)
Unvested, ending balance	1,393,268	242,943	281,825
Weighted Average Grant Date Fair Value
Unvested, beginning balance	$ 37.95	$ 34.56	$ 30.59
Granted	10.25	37.74	38.32
Vested	37.96	32.32	30.38
Canceled	39.41	35.09	29.69
Unvested, ending balance	$ 12.47	$ 37.95	$ 34.56
Performance Shares [Member]
Awards Outstanding
Unvested, beginning balance	1,058,710	1,539,794	1,445,563
Granted		332,651	391,530
Vested	(279,053)	(810,655)	(292,266)
Canceled	(312,827)	(3,080)	(5,033)
Unvested, ending balance	466,830	1,058,710	1,539,794
Weighted Average Grant Date Fair Value
Unvested, beginning balance	$ 36.15	$ 30.15	$ 29.26
Granted		35.77	30.23
Vested	32.43	24.58	25.91
Canceled	42.41	42.41	27.10
Unvested, ending balance	$ 34.17	$ 36.15	$ 30.15

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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