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Retirement Benefit Plans - Plan Assets (Details) - USD ($) $ in Millions | Jan. 31, 2018 | Jan. 31, 2017
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Plans with accumulated benefit obligations in excess of plan assets: |  |
Accumulated benefit obligations | $ 130.7 | $ 119.2
Plan assets | 112.1 | 98.3
Plans with projected benefit obligations in excess of plan assets: |  |
Projected benefit obligations | 158.1 | 146.4
Plan assets | $ 121.1 | $ 107.4

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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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