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Deferred Compensation Additional Information (Details) - USD ($) $ in Millions | Apr. 30, 2017 | Jan. 31, 2017
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Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Marketable securities | $ 735.5 |
Rabbi Trust Member |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |
Deferred compensation liability | 52.5 | $ 47.3
Deferred compensation liability current | 3.1 | 3.1
Deferred compensation liability non-current | $ 49.4 | $ 44.2

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