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Financial Instruments (Details) (USD $) | 3 Months Ended | 6 Months Ended
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Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2014 | Jul. 31, 2013
Disclosure Text Block Supplement [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ (1,000) | $ (10,000) | $ (5,000) | $ (6,000)

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 + Details
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