CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (unaudited) (Parenthetical) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Apr. 30, 2016 |
Apr. 30, 2015 |
|
| Statement Of Income And Comprehensive Income [Abstract] | ||
| Foreign currency translation adjustments, tax | $ 0.2 | $ 0.0 |