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Common Stock Repurchases (Details) (USD $) Share data in Millions, unless otherwise specified | 3 Months Ended
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Feb. 28, 2015 | Feb. 28, 2014
Common Stock Repurchases [Abstract] |  |
Common stock repurchased and retired (in shares) | 0.3 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 0.4 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Common stock repurchased and retired | $ 7,800,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 9,800,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Authorized amount for share repurchase programs | $ 100,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |

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- Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant