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Retirement Benefit Plans - Balance Sheet (Details) - USD ($) $ in Millions | Jan. 31, 2017 | Jan. 31, 2016
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Defined Benefit Plan Disclosure [Line Items] |  |
Amounts Recognized in Balance Sheet | $ 75.9 | $ 76.0
Other long-term liabilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amounts Recognized in Balance Sheet | 39.0 | 43.8
Accumulated other comprehensive loss |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amounts Recognized in Balance Sheet | $ 36.9 | $ 32.2

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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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: 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=65897934&loc=d3e1928-114920 + Details
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