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PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Jan. 31, 2022
Indefinite-Lived Intangible Assets
Goodwill	$ 28,033	$ 27,943	$ 28,033
Intangible Assets - Gross Carrying Amount	7,426
Accumulated Amortization	4,252
Intangible Assets, Net (Excluding Goodwill)	3,175		3,322
Amortization of intangibles	166	$ 228
TRC.
Indefinite-Lived Intangible Assets
Goodwill			9,500
GPS.
Indefinite-Lived Intangible Assets
Goodwill	$ 18,500
Trade Name
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	15 years
Finite Lived Intangible Assets - Gross Carrying Amount	$ 4,499
Accumulated Amortization	1,925
Finite Lived Intangible Assets - Net Amount	$ 2,574		2,650
Process certifications
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	7 years
Finite Lived Intangible Assets - Gross Carrying Amount	$ 1,897
Accumulated Amortization	1,739
Finite Lived Intangible Assets - Net Amount	$ 158		226
Customer relationships
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	10 years
Finite Lived Intangible Assets - Gross Carrying Amount	$ 916
Accumulated Amortization	588
Finite Lived Intangible Assets - Net Amount	$ 328		351
Customer relationships | Minimum
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	10 years
Customer Contracts
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	1 year
Intangible Assets - Gross Carrying Amount	$ 114
Finite Lived Intangible Assets - Net Amount	$ 114		$ 95

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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