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PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 01, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2016
Finite-Lived Intangible Assets |  |  |  |  |
Intangible Assets - Gross Carrying Amount |  | $ 11,566 |  |  |
Accumulated Amortization |  | 6,565 |  |  |
Finite Lived Intangible Assets - Net Amount |  | 5,001 |  |  |
Other intangible assets, net |  | 5,001 | $ 6,137 |  |
Additions to other intangible assets |  | 0 | 0 | $ 0 |
Additions to impairment losses |  | 0 | 0 |  |
Amortization of purchased intangible assets |  | 1,136 | 1,012 | 1,032 |
Indefinite-Lived Intangible Assets |  |  |  |  |
Goodwill allocated for income tax reporting purposes |  | $ 16,400 |  |  |
Period of amortization of goodwill for income tax purpose |  | 15 years |  |  |
Impairment loss |  | $ 4,895 | 1,491 | 584 |
APC |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Percentage of goodwill acquired |  |  |  |  | 100.00%
TRC |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Percentage of average annual growth in revenues over the next seven years | 4.70% |  |  |  |
Expected annual growth in revenues period | 7 years |  |  |  |
Expected terminal value annual growth rate | 3.00% |  |  |  |
Percentage of average annual growth in earnings before interest and taxes by the year ending January 31, 2027 | 6.50% |  |  |  |
Percentage of average annual growth in earnings before interest and taxes for the year ending January 31, 2021 | 4.80% |  |  |  |
Percentage of goodwill acquired |  |  |  |  | 34.00%
Indefinite-Lived Intangible Assets |  |  |  |  |
Goodwill Impairment Loss | $ 2,800 |  | 1,500 | 600 |
TRC |  |  |  |  |
Indefinite-Lived Intangible Assets |  |  |  |  |
Impairment loss |  | 2,823 | 1,491 | $ 584 |
APC |  |  |  |  |
Indefinite-Lived Intangible Assets |  |  |  |  |
Impairment loss |  | $ 2,072 |  |  |
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 |  |  |
Accumulated Amortization |  | 3,193 |  |  |
Finite Lived Intangible Assets - Net Amount |  | $ 450 | 694 |  |
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 |  |  |
Accumulated Amortization |  | 1,250 |  |  |
Finite Lived Intangible Assets - Net Amount |  | 3,249 | 3,549 |  |
Trade names | SMC | Trade names | SMC |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Accumulated Amortization |  | 181 |  |  |
Indefinite-lived Intangible Assets |  | $ 181 | 181 |  |
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 |  | 1,129 |  |  |
Finite Lived Intangible Assets - Net Amount |  | 768 | 1,039 |  |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Finite Lived Intangible Assets - Gross Carrying Amount |  | 1,346 |  |  |
Accumulated Amortization |  | 812 |  |  |
Finite Lived Intangible Assets - Net Amount |  | $ 534 | $ 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 |  |  |

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