PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Jan. 31, 2021
Indefinite-Lived Intangible Assets
Goodwill	$ 27,943	$ 27,943	$ 27,943
Intangible Assets - Gross Carrying Amount	10,955
Accumulated Amortization	7,086
Intangible Assets, Net (Excluding Goodwill)	3,869		4,097
Amortization of intangibles	228	$ 225
TRC
Indefinite-Lived Intangible Assets
Goodwill	9,500		9,500
GPS
Indefinite-Lived Intangible Assets
Goodwill	$ 18,500		18,500
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	1,625
Finite Lived Intangible Assets - Net Amount	$ 2,874		2,949
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	3,497
Finite Lived Intangible Assets - Net Amount	$ 146		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	1,468
Finite Lived Intangible Assets - Net Amount	$ 429		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	496
Finite Lived Intangible Assets - Net Amount	$ 420		$ 443