PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Jan. 31, 2019
Finite-Lived Intangible Assets
Intangible Assets - Gross Carrying Amount	$ 11,566
Accumulated Amortization	5,728
Other intangible assets, net	5,838		$ 6,137
Amortization of purchased intangible assets	299	$ 253
Indefinite-Lived Intangible Assets
Goodwill	30,766	$ 34,329	32,838
Impairment loss	2,072
GPS
Indefinite-Lived Intangible Assets
Goodwill	18,500		18,500
TRC
Indefinite-Lived Intangible Assets
Goodwill	12,300		12,300
APC
Indefinite-Lived Intangible Assets
Impairment loss	$ 2,100
Trade names
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	15 years
Finite Lived Intangible Assets - Gross Carrying Amount	$ 8,323
Accumulated Amortization	4,080
Finite Lived Intangible Assets - Net Amount	$ 4,243		4,424
Process certifications
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	7 years
Finite Lived Intangible Assets - Gross Carrying Amount	$ 1,897
Accumulated Amortization	926
Finite Lived Intangible Assets - Net Amount	971		1,039
Customer relationships
Finite-Lived Intangible Assets
Finite Lived Intangible Assets - Gross Carrying Amount	1,346
Accumulated Amortization	722
Finite Lived Intangible Assets - Net Amount	$ 624		$ 674
Customer relationships | Maximum
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	10 years
Customer relationships | Minimum
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	4 years