PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Jan. 31, 2017	Apr. 30, 2016
Finite-Lived Intangible Assets
Intangible Assets, Gross Amount	$ 11,612
Accumulated amortization	3,614
Intangible Assets - Net Amount	7,998	$ 8,181
Indefinite-Lived Intangible Assets
Goodwill	34,913	34,913	$ 36,813
GPS
Indefinite-Lived Intangible Assets
Goodwill	18,500	18,500
TRC
Indefinite-Lived Intangible Assets
Goodwill	14,400	14,400
APC
Indefinite-Lived Intangible Assets
Goodwill	$ 2,000	2,000
Trade Name | GPS/TRC
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	15 years
Finite Lived Intangible Assets - Gross Amount	$ 8,142
Accumulated amortization	2,875
Finite Lived Intangible Assets - Net Amount	$ 5,267	5,328
Process certifications | TRC
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	7 years
Finite Lived Intangible Assets - Gross Amount	$ 1,897
Accumulated amortization	384
Finite Lived Intangible Assets - Net Amount	1,513	1,581
Customer Relationships | TRC/APC
Finite-Lived Intangible Assets
Finite Lived Intangible Assets - Gross Amount	1,346
Accumulated amortization	323
Finite Lived Intangible Assets - Net Amount	$ 1,023	1,072
Customer Relationships | TRC/APC | Minimum
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	4 years
Customer Relationships | TRC/APC | Maximum
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	10 years
Other intangibles
Finite-Lived Intangible Assets
Finite Lived Intangible Assets - Gross Amount	$ 46
Accumulated amortization	32
Finite Lived Intangible Assets - Net Amount	$ 14	$ 19