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Basis of Presentation Reclassification (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2016 | Apr. 30, 2016 | Jul. 31, 2015 | Jul. 31, 2016 | Jul. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Provision for income taxes | $ 25.2 | $ (14.4) | $ 269.5 | $ 39.6 | $ 272.2
Operating expenses | $ 528.5 |  | 512.2 | $ 1,097.7 | 1,045.4
Employee Benefits and Estimated Personal Property Liabilities |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Operating expenses |  |  |  |  | 5.7
Restatement Adjustment |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Provision for income taxes |  |  | $ 33.1 |  | $ 33.1

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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