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Basis of Presentation Reclassification (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Operating Expenses | $ 574.4 | $ 533.2
Employee Benefits and Estimated Personal Property Liabilities |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Operating Expenses |  | $ 5.7

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