PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 01, 2021	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2016	Jan. 31, 2019
Indefinite-Lived Intangible Assets
Goodwill allocated for income tax reporting purposes		$ 16,500
Period of amortization of goodwill for income tax purpose		15 years
Goodwill Impairment Loss		$ 0
Goodwill		28,033	$ 27,943	$ 27,943		$ 32,838
Impairment loss		7,901		4,895
Payment for acquisition		600
Finite Lived Intangible Assets - Gross Carrying Amount		11,050
Accumulated Amortization		7,728
Finite Lived Intangible Assets - Net Amount		3,322	4,097
Intangible Assets, Net (Excluding Goodwill)		3,322	4,097
Additions to other intangible assets		0	0	0
Additions to impairment losses		0	0	0
Amortization of intangibles		870	904	1,136
APC
Indefinite-Lived Intangible Assets
Percentage of goodwill acquired					100.00%
TRC
Indefinite-Lived Intangible Assets
Goodwill Impairment Loss			2,800
Percentage of goodwill acquired					34.00%
APC
Indefinite-Lived Intangible Assets
Goodwill						$ 2,072
Impairment loss			2,100	$ 2,072
SMC
Indefinite-Lived Intangible Assets
Goodwill		90
TRC.
Indefinite-Lived Intangible Assets
Excess of the fair value over the carrying value	$ 8,900
Goodwill		9,500	9,500
LTI
Indefinite-Lived Intangible Assets
Payment for acquisition		$ 600
Trade Name | 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		1,849
Finite Lived Intangible Assets - Net Amount		$ 2,650	2,949
Trade Name | 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		$ 3,643
Finite Lived Intangible Assets - Net Amount			208
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		1,671
Finite Lived Intangible Assets - Net Amount		$ 226	497
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		565
Finite Lived Intangible Assets - Net Amount		$ 351	$ 443
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
Finite Lived Intangible Assets - Gross Carrying Amount		$ 95
Finite Lived Intangible Assets - Net Amount		$ 95