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Earnings Per Share (Basic and Diluted Loss Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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, 2018
Nov. 30, 2017
Nov. 30, 2016
Numerator:                      
Net income $ 96,836 $ 87,476 $ 57,308 $ (71,255) $ 84,346 $ 50,208 $ 31,782 $ 14,259 $ 170,365 $ 180,595 $ 105,615
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic                 (51) (56) (45)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic                 (927) (1,121) (508)
Numerator for basic earnings per share                 169,387 179,418 105,062
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes                 3,190 2,654 2,667
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted                 927 1,121 508
Less: Undistributed earnings reallocated to nonvested restricted stock                 (805) (979) (453)
Numerator for diluted earnings per share                 $ 172,699 $ 182,214 $ 107,784
Denominator:                      
Weighted average shares outstanding — basic                 87,773 85,842 85,706
Share-based payments, shares                 4,884 4,072 2,170
Convertible senior notes, shares                 8,402 8,402 8,402
Weighted average shares outstanding — diluted                 101,059 98,316 96,278
Basic earnings (loss) per share, in dollars per share $ 1.09 $ 0.99 $ 0.65 $ (0.82) $ 0.97 $ 0.58 $ 0.37 $ 0.17 $ 1.93 $ 2.09 $ 1.23
Diluted earnings (loss) per share, in dollars per share $ 0.96 $ 0.87 $ 0.57 $ (0.82) $ 0.84 $ 0.51 $ 0.33 $ 0.15 $ 1.71 $ 1.85 $ 1.12