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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | 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, 2018 | Nov. 30, 2017 | Nov. 30, 2016 | May 14, 2018 | Jan. 12, 2016 | Nov. 30, 2015 | 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 |  |  |  |  |  |
Authorized repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |
Excess Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,373,000 |  |  |  |
Common Stock, Shares, Issued | 119,195,914 |  |  |  | 117,945,525 |  |  |  |  |  |  |  | 119,195,914 | 117,945,525 |  |  |  |  |  |
Stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,039 | $ 0 | $ 85,938 |  |  |  |  |
Treasury stock, Value |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,476 | 6,673 | $ 2,421 |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 10,000,000 |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  |  |  | 1,806,053 |  | 8,373,000 |  |  |  |  |
Stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000 |  | $ 85,900 |  |  |  |  |
Not Part of a Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, Value |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,500 | $ 6,700 | $ 2,400 |  |  |  |  |
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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