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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015 | Feb. 23, 2015 | May 27, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common shares authorized for repurchase, shares |  |  |  | 20,000,000 | 10,000,000
Remaining common shares authorized for repurchase, shares | 5,995,059 |  |  |  |
Stock repurchased and retired during period, total cost | $ 47,839 | $ 475,424 | $ 615,421 |  |
Employee Stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchased and retired during period, common shares | 55,769 | 247,124 |  |  |
Stock repurchased and retired during period, total cost | $ 2,052 | $ 10,120 |  |  |

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