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PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2018 | Jan. 31, 2018 | Jul. 31, 2017
Finite-Lived Intangible Assets |  |  |
Intangible Assets - Gross Carrying Amount | $ 11,566 |  |
Accumulated Amortization | 4,923 |  |
Other intangible assets, net | 6,643 | $ 7,149 |
Indefinite-Lived Intangible Assets |  |  |
Goodwill | 34,329 | 34,329 | $ 34,913
GPS |  |  |
Indefinite-Lived Intangible Assets |  |  |
Goodwill | 18,500 | 18,500 |
TRC |  |  |
Indefinite-Lived Intangible Assets |  |  |
Goodwill | 13,800 | 13,800 |
APC |  |  |
Indefinite-Lived Intangible Assets |  |  |
Goodwill | $ 2,000 | 2,000 |
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 | 3,628 |  |
Finite Lived Intangible Assets - Net Amount | $ 4,695 | 4,966 |
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 | 723 |  |
Finite Lived Intangible Assets - Net Amount | 1,174 | 1,310 |
Customer relationships |  |  |
Finite-Lived Intangible Assets |  |  |
Finite Lived Intangible Assets - Gross Carrying Amount | 1,346 |  |
Accumulated Amortization | 572 |  |
Finite Lived Intangible Assets - Net Amount | $ 774 | $ 873 |
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 |  |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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