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Fair Value (Details) - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
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Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2014 | Jan. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract] |  |  |  |  |  |  |  |
Balance | $ 323 | $ 311 | $ 299 | $ 272 | $ 262 | $ 252 | $ 289 | $ 252
Current period activity | $ 12 | $ 12 | $ 10 | $ 10 | $ 10 | $ 0 |  |

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- Definition Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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