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Stockholders' Equity (Narratives) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2016 | May 31, 2015 | May 31, 2016 | May 31, 2015 | Feb. 29, 2016 | Jan. 12, 2016 | Nov. 30, 2015
Equity [Abstract] |  |  |  |  |  |  |
Dividend paid in each quarter (in dollars per share) | $ 0.0250 | $ 0.0250 | $ 0.05 | $ 0.05 |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of common stock, authorized, approved under a board approved stock repurchase program |  |  |  |  |  |  | 4,000,000
Common stock reserve, shares | 12,602,735 |  | 12,602,735 |  |  |  |
Treasury Stock, Value | $ 534,574 |  | $ 534,574 |  |  |  | $ 447,043
Stock repurchases |  |  | 87,531 | $ 300 |  |  |
January 2016 Stock Repurchase Program [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of common stock, authorized, approved under a board approved stock repurchase program |  |  |  |  |  | 10,000,000 |
Stock repurchases |  |  | $ 85,900 |  |  |  |
Treasury Stock, Shares, Acquired | 0 |  | 8,373,000 |  |  |  |
Shares Withheld to Pay Taxes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock repurchases |  |  | $ 1,600 |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 155,789 |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Common Stock, Shares, Issued |  |  |  |  | 374,630 |  |

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- Definition Aggregate number of common shares reserved for future issuance. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + 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 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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