INTANGIBLE ASSETS AND GOODWILL INTANGIBLE ASSETS AND GOODWILL - AMORTIZATION AND IMPAIRMENT (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Apr. 30, 2018 |
Apr. 30, 2017 |
|
| Finite-Lived Intangible Assets | ||
| Amortization of intangible assets | $ 15,100,000 | $ 21,100,000 |
| Impairment of goodwill | 0 | 0 |
| Impairment of acquired intangible assets | $ 0 | $ 0 |