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PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2018 USD ($) | Jan. 31, 2019 USD ($) | Jan. 31, 2019 USD ($) | Jan. 31, 2018 USD ($) | Jan. 31, 2017 USD ($)
Finite-Lived Intangible Assets |  |  |  |  |
Percentage of contract backlog suspended |  |  |  |  | 90.00%
Intangible Assets - Gross Carrying Amount |  | $ 11,566 | $ 11,566 |  |
Accumulated Amortization |  | 5,429 | 5,429 |  |
Finite Lived Intangible Assets - Net Amount |  | 5,956 | 5,956 |  |
Other intangible assets, net |  | 6,137 | 6,137 | $ 7,149 |
Additions to other intangible assets |  |  | 0 | 0 |
Additions to impairment losses |  |  | 0 | 0 |
Amortization of purchased intangible assets |  |  | 1,012 | 1,032 | $ 1,163
Indefinite-Lived Intangible Assets |  |  |  |  |
Goodwill |  | 32,838 | 32,838 | 34,329 | 34,913
Goodwill allocated for income tax reporting purposes |  | $ 16,400 | 16,400 |  |
Period of amortization of goodwill for income tax purpose |  | 15 years |  |  |
Impairment loss |  |  | 1,491 | 584 | 1,979
APC |  |  |  |  |
Indefinite-Lived Intangible Assets |  |  |  |  |
Impairment loss |  |  | 0 |  | $ 2,000
TRC |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Percentage of average annual growth in revenues over the next seven years | 4.9 |  |  |  |
Expected annual growth in revenues period | 7 years |  |  |  |
Percentage of average annual growth in earnings before interest and taxes | 6.5 |  |  |  |
Indefinite-Lived Intangible Assets |  |  |  |  |
Goodwill Impairment Loss | $ 1,500 |  |  | 600 |
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 |  |  |  |  |
Goodwill |  | 2,000 | $ 2,000 |  |
Trade names | GPS |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Finite-Lived Intangible Assets - Estimated Useful Life |  |  | 15 years |  |
Finite Lived Intangible Assets - Gross Carrying Amount |  | 3,643 | $ 3,643 |  |
Accumulated Amortization |  | 2,949 | 2,949 |  |
Finite Lived Intangible Assets - Net Amount |  | 694 | $ 694 | 936 |
Trade names | TRC |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Finite-Lived Intangible Assets - Estimated Useful Life |  |  | 15 years |  |
Finite Lived Intangible Assets - Gross Carrying Amount |  | 4,499 | $ 4,499 |  |
Accumulated Amortization |  | 950 | 950 |  |
Finite Lived Intangible Assets - Net Amount |  | 3,549 | $ 3,549 | 3,849 |
Process certifications |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Finite-Lived Intangible Assets - Estimated Useful Life |  |  | 7 years |  |
Finite Lived Intangible Assets - Gross Carrying Amount |  | 1,897 | $ 1,897 |  |
Accumulated Amortization |  | 858 | 858 |  |
Finite Lived Intangible Assets - Net Amount |  | 1,039 | 1,039 | 1,310 |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Finite Lived Intangible Assets - Gross Carrying Amount |  | 1,346 | 1,346 |  |
Accumulated Amortization |  | 672 | 672 |  |
Finite Lived Intangible Assets - Net Amount |  | $ 674 | $ 674 | $ 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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