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Stock Repurchase Program and Cash Dividend (Details Textual 1) - $ / shares | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 09, 2018 | Jan. 31, 2018 | Jan. 31, 2017
Subsequent Event [Line Items] |  |  |
Treasury Stock, Shares, Acquired |  | 4,427,000 | 557,000
Treasury Stock Acquired, Average Cost Per Share |  | $ 47.43 | $ 27.33
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Treasury Stock, Shares, Acquired | 1,800,000 |  |
Treasury Stock Acquired, Average Cost Per Share | $ 45.44 |  |

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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 S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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=84159872&loc=d3e21463-112644 + Details
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