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PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 01, 2020	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2016	Jan. 31, 2018
Indefinite-Lived Intangible Assets
Goodwill allocated for income tax reporting purposes		$ 16,400
Period of amortization of goodwill for income tax purpose		15 years
Goodwill Impairment Loss		$ 0
Goodwill		27,943	$ 27,943	$ 32,838		$ 34,329
Impairment losses		0	4,895	1,491
Intangible Assets - Gross Carrying Amount		11,385
Accumulated Amortization		7,288
Finite Lived Intangible Assets - Net Amount		4,097	5,001
Additions to other intangible assets		0	0	0
Additions to impairment losses		0	0	0
Amortization of intangibles		904	1,136	1,012
APC
Indefinite-Lived Intangible Assets
Percentage of goodwill acquired					100.00%
TRC
Indefinite-Lived Intangible Assets
Goodwill Impairment Loss			2,800	1,500
Percentage of expected annual growth rate	3.00%
Percentage of profit forecast For Fiscal Year 2022	3.10%
Percentage of profit forecast for fiscal year 2026	6.80%
Percentage of goodwill acquired					34.00%
APC
Indefinite-Lived Intangible Assets
Goodwill				2,072		$ 2,072
Impairment losses		0	2,072	$ 0
TRC
Indefinite-Lived Intangible Assets
Excess of the fair value over the carrying value	$ 1,500
Goodwill		$ 9,500
Trade names | GPS
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life		15 years
Finite Lived Intangible Assets - Gross Carrying Amount		$ 3,643
Accumulated Amortization		3,435
Finite Lived Intangible Assets - Net Amount		$ 208	450
Trade names | TRC
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life		15 years
Finite Lived Intangible Assets - Gross Carrying Amount		$ 4,499
Accumulated Amortization		1,550
Finite Lived Intangible Assets - Net Amount		$ 2,949	3,249
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		1,400
Finite Lived Intangible Assets - Net Amount		497	768
Customer relationships
Indefinite-Lived Intangible Assets
Finite Lived Intangible Assets - Gross Carrying Amount		1,346
Accumulated Amortization		903
Finite Lived Intangible Assets - Net Amount		$ 443	$ 534
Customer relationships | Maximum
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life		10 years
Customer relationships | Minimum
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life		4 years

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Amount of additions to other intangible assets.

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