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Stockholder's Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2011 | Feb. 28, 2011 | Nov. 30, 2010 | Aug. 31, 2010 | May 31, 2010 | Feb. 28, 2010 | Nov. 30, 2009 | Aug. 31, 2009 | May 31, 2009 | Feb. 28, 2009 | Nov. 30, 2011 | Nov. 30, 2010 | Nov. 30, 2009
Stockholder's Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares that can be purchased by exercising each right | 0.01 |  |  |  |  |  |  |  |  |  |  |  | 0.01 |  |
Purchase price for right holders | $ 85.00 |  |  |  |  |  |  |  |  |  |  |  | $ 85.00 |  |
Exercisable options available |  |  |  |  |  |  |  |  |  |  |  |  | earlier of (i) 10 calendar days after a public announcement by the Company that a person or group has become an Acquiring Person (as defined under the 2009 Rights Agreement) and (ii) 10 business days after the commencement of a tender or exchange offer by a person or group if upon consummation of the offer the person or group would beneficially own 4.9% or more of the Company’s outstanding common stock. |  |
Calendar days after a public announcement during which rights to be exercised |  |  |  |  |  |  |  |  |  |  |  |  | 10 days |  |
Business days after the commencement of a tender or exchange offer during which rights to be exercised |  |  |  |  |  |  |  |  |  |  |  |  | 10 days |  |
Beneficially ownership in company's outstanding common stock to be held by person or group to exercise rights |  |  |  |  |  |  |  |  |  |  |  |  | 4.90% |  |
Price at which company may redeem all of the then outstanding rights | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |
Options under which right issued pursuant to the 2009 rights Agreement will expire |  |  |  |  |  |  |  |  |  |  |  |  | earliest of (a) the close of business on March 5, 2019, (b) the time at which the rights are redeemed, (c) the time at which the rights are exchanged, (d) the time at which the Company’s board of directors determines that a related provision in the Company’s Restated Certificate of Incorporation is no longer necessary, and (e) the close of business on the first day of a taxable year of the Company to which the Company’s board of directors determines that no tax benefits may be carried forward. At the Company’s annual meeting of stockholders on April 2, 2009, the Company’s stockholders approved the 2009 Rights Agreement |  |
Repurchase of common stock Authorized |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  | 4,000,000 |
Cash dividend declared per share | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.0625 |  |  |
Repurchases of common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ (350) | $ (616)

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