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Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended | 158 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2008 | Jan. 31, 2008 | Mar. 04, 2017 | Feb. 27, 2016 | Feb. 28, 2015 | Mar. 04, 2017 | Feb. 28, 2004
Class of Stock [Line Items] |  |  |  |  |  |  |
Junior preferred stock, shares |  |  | 200,000 |  |  | 200,000 |
Junior preferred stock par value |  |  | $ 1.00 |  |  | $ 1.00 |
Share repurchases, shares |  |  | (250,000) | 575,000 | 203,000 |  |
Stock Based Compensation Plans |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Adjustments Related to Tax Withholding for Share-based Compensation |  |  | $ 2.6 | $ 5.1 | $ 5.2 |  |
Share Repurchase Program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares authorized under share repurchase program |  |  |  |  |  |  | 1,500,000
Increase in authorized shares under the share repurchase program | 1,000,000 | 750,000 | 1,000,000 |  |  |  |
Share repurchases, shares |  |  | 250,001 | 575,000 | 203,509 | 3,307,633 |
Share repurchases, value |  |  | $ 10.8 | $ 24.9 | $ 6.9 | $ 72.3 |
Remaining shares authorized to be repurchased |  |  | 942,367,000 |  |  | 942,367,000 |

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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