PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 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	7,311		7,311
Intangible Assets, Net (Excluding Goodwill)	3,644		3,644		4,097
Amortization of intangibles	225	$ 226	453	$ 451
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	1,700		1,700
Finite Lived Intangible Assets - Net Amount	2,799		2,799		2,949
GPS
Indefinite-Lived Intangible Assets
Goodwill	18,500		$ 18,500		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	3,557		3,557
Finite Lived Intangible Assets - Net Amount	86		$ 86		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	1,535		1,535
Finite Lived Intangible Assets - Net Amount	362		$ 362		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	519		519
Finite Lived Intangible Assets - Net Amount	$ 397		$ 397		$ 443
Customer relationships | Minimum
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life			10 years