PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Indefinite-Lived Intangible Assets
Goodwill	$ 27,943	$ 27,943	$ 27,943	$ 27,943	$ 27,943
Intangible Assets - Gross Carrying Amount	10,955		10,955
Accumulated Amortization	7,538		7,538
Intangible Assets, Net (Excluding Goodwill)	3,417		3,417		4,097
Amortization of intangibles	227	$ 226	680	$ 677
TRC
Indefinite-Lived Intangible Assets
Goodwill	9,500		$ 9,500		9,500
TRC | Trade names
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life			15 years
Finite Lived Intangible Assets - Gross Carrying Amount	4,499		$ 4,499
Accumulated Amortization	1,775		1,775
Finite Lived Intangible Assets - Net Amount	2,724		$ 2,724		2,949
GPS
Indefinite-Lived Intangible Assets
Goodwill					18,500
GPS | Trade names
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life			15 years
Finite Lived Intangible Assets - Gross Carrying Amount	3,643		$ 3,643
Accumulated Amortization	3,617		3,617
Finite Lived Intangible Assets - Net Amount	26		$ 26		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		$ 1,897
Accumulated Amortization	1,604		1,604
Finite Lived Intangible Assets - Net Amount	293		$ 293		497
Customer relationships
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life			10 years
Finite Lived Intangible Assets - Gross Carrying Amount	916		$ 916
Accumulated Amortization	542		542
Finite Lived Intangible Assets - Net Amount	$ 374		$ 374		$ 443
Customer relationships | Minimum
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life			10 years