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Stock Issuance and Stock Repurchase Program (Details) - $ / shares shares in Thousands | 3 Months Ended
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Apr. 30, 2016 | Jan. 31, 2016 | Jan. 31, 2015
Share Repurchase Program [Abstract] |  |  |
Number of shares purchased |  | 4,770 | 201
Average price per share |  | $ 31.48 | $ 31.08
Remaining authorization at January 31: |  | 13,765 | 19,999
Subsequent Event [Member] |  |  |
Share Repurchase Program [Abstract] |  |  |
Number of shares purchased | 2,000 |  |
Average price per share | $ 27.19 |  |

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- Definition Share repurchase program. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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