Retirement Benefit Plans - Benefit Obligation Assumptions (Details)	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Discount rate	2.40%	2.20%	1.80%
Rate of compensation increase	1.20%	2.20%	2.00%

Expected rate of compensation increases (for pay-related plans).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(2)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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