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Retirement Benefit Plans - Balance Sheet (Details) - USD ($) $ in Millions | Jan. 31, 2018 | Jan. 31, 2017
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Retirement Benefits [Abstract] |  |
Other long-term liabilities | $ 37.0 | $ 39.0
Accumulated other comprehensive loss, before tax | 31.7 | 37.0
Net amount recognized | $ 68.7 | $ 76.0

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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