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Deferred Compensation Additional Information (Details) - USD ($) $ in Millions | Jul. 31, 2016 | Jan. 31, 2016
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Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Marketable securities | $ 1,100.0 |
Rabbi Trust Member |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred compensation liability | 45.6 | $ 38.0
Deferred compensation liability current | 2.1 | 1.9
Deferred compensation liability non-current | $ 43.5 | $ 36.1

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