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Retirement Benefit Plans - Balance Sheet (Details) (USD $) In Millions, unless otherwise specified | Jan. 31, 2015 | Jan. 31, 2014
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Defined Benefit Plan Disclosure [Line Items] |  |
Amounts Recognized in Balance Sheet | $ 67.1 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet | $ 30.2 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
Other long-term liabilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amounts Recognized in Balance Sheet | 40.5 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember | 21.5 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Accumulated other comprehensive loss, before tax |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amounts Recognized in Balance Sheet | $ 26.6 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 8.7 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_BalanceSheetLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember

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- Definition The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Details
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