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Derivative Instruments - Effect of Cash Flow Hedges on Income Statement (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total revenues | $ 825,055 | $ 618,643
Revenues |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gains (losses) related to foreign currency forward contracts designated as cash flow hedges | $ 16 |

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