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Deferred Compensation Additional Information (Details) - USD ($) $ in Millions | Oct. 31, 2017 | Jan. 31, 2017
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Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Marketable securities | $ 693.0 |
Rabbi Trust Member |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred compensation liability | 56.5 | $ 47.3
Deferred compensation liability current | 3.8 | 3.1
Deferred compensation liability non-current | $ 52.7 | $ 44.2

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