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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2020 | Aug. 31, 2020 | May 31, 2020 | Feb. 29, 2020 | Nov. 30, 2019 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2018 | May 14, 2018 | Jan. 12, 2016 | Jul. 17, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price for right holders | $ 85.00 |  |  |  |  |  |  |  |  |  |  |  | $ 85.00 |  |  |  |  |
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 |  |  |  |  |
Stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 35,039 |  |  |
Shares of common stock authorized | 290,000,000 |  |  |  | 290,000,000 |  |  |  |  |  |  |  | 290,000,000 | 290,000,000 |  |  |  |
Shares of common stock issued | 99,868,625 |  |  |  | 121,592,978 |  |  |  |  |  |  |  | 99,868,625 | 121,592,978 |  |  |  |
Cash dividend paid per share | $ 0.15 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 |  |  |  |  |  |
Cash dividend declared per share | $ 0.15 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 | $ 0.025 |  |  |  |  |  |
Value of treasury stock acquired |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,503 | $ 7,288 | $ 8,476 |  |  |
Retirement of treasury stock, shares |  |  |  |  |  |  |  |  |  |  |  |  | 23,487,966 |  |  |  |  |
Director Plan SARs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 680,000
Shares of common stock authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 680,000
Shares of common stock issued | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
January 2016 Stock Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 1,627,000 |
Treasury stock acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,806,053 |  |  |
Stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000 |  |  |
Not Part of a Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of treasury stock acquired |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,500 | $ 7,300 | $ 8,500 |  |  |

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