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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2015 | Nov. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2015 | Jan. 12, 2016 | Jul. 17, 2014 | Jan. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized | 290,000,000 |  |  |  | 290,000,000 |  |  |  |  |  |  |  | 290,000,000 | 290,000,000 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 12,602,735 |  |  |  |  |  |  |  |  |  |  |  | 12,602,735 |  |  |  |  |
Authorized repurchase of common stock |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  | 4,000,000 |  |  |
Common Stock, Shares, Issued | 117,945,525 |  |  |  | 116,224,208 |  |  |  |  |  |  |  | 117,945,525 | 116,224,208 |  |  |  |
Stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,673 | $ 88,359 | $ 567 |  |  |
Treasury stock, Value |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,673 | $ 88,359 | 567 |  |  |
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 (a) 10 calendar days after a public announcement by us that a person or group has become an Acquiring Person (as defined under the 2009 Rights Agreement) and (b) 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 our 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 our board of directors determines that a related provision in our Restated Certificate of Incorporation is no longer necessary, and (e) the close of business on the first day of a taxable year of ours to which our board of directors determines that no tax benefits may be carried forward. At our annual meeting of stockholders on April 2, 2009, our stockholders approved the 2009 Rights Agreement. |  |  |  |  |
Cash dividend declared per share | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 |  |  |  |  |  |
Director Plan SARs [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 680,000 |
Authorized repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 680,000 |
Common Stock, Shares, Issued | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
January 2016 Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,373,000 |  |  |  |
Stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,900 |  |  |  |
Not Part of a Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, Value |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,700 | $ 2,500 | $ 600 |  |  |
Convertible senior notes due February 1, 2019 at 1.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.375% |  |  |  |  |  |  |  |  |  |  |  | 1.375% |  |  |  |  | 1.375%

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