PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Jan. 31, 2020
Indefinite-Lived Intangible Assets
Goodwill	$ 27,943	$ 30,766	$ 27,943
Impairment loss		2,072
Finite Lived Intangible Assets - Gross Carrying Amount	11,385
Accumulated Amortization	6,609
Finite Lived Intangible Assets - Net Amount	4,776		5,001
APC
Indefinite-Lived Intangible Assets
Impairment loss		$ 2,100
GPS/TRC
Indefinite-Lived Intangible Assets
Goodwill	$ 18,500		9,500
Trade names
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	15 years
Finite Lived Intangible Assets - Gross Carrying Amount	$ 8,142
Accumulated Amortization	4,578
Finite Lived Intangible Assets - Net Amount	$ 3,564		3,699
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	1,197
Finite Lived Intangible Assets - Net Amount	700		768
Customer relationships
Indefinite-Lived Intangible Assets
Finite Lived Intangible Assets - Gross Carrying Amount	1,346
Accumulated Amortization	834
Finite Lived Intangible Assets - Net Amount	$ 512		$ 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