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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, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Numerator:
Net income	$ 37,528	$ 39,363	$ 15,597	$ 13,127	$ 44,017	$ 23,254	$ 9,573	$ 7,799	$ 105,615	$ 84,643	$ 918,349
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic									(45)	(33)	(26)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									(508)	(273)	(2,667)
Numerator for basic earnings per share									105,062	84,337	915,656
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes									2,667	2,667	2,667
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted									508	273	2,667
Less: Undistributed earnings reallocated to nonvested restricted stock									(453)	(244)	(2,398)
Numerator for diluted earnings per share									$ 107,784	$ 87,033	$ 918,592
Denominator:
Weighted average shares outstanding — basic									85,706	92,054	89,265
Share-based payments, shares									2,170	2,401	1,647
Convertible senior notes, shares									8,402	8,402	8,402
Weighted average shares outstanding — diluted									96,278	102,857	99,314
Basic earnings (loss) per share, in dollars per share	$ 0.44	$ 0.46	$ 0.18	$ 0.15	$ 0.48	$ 0.25	$ 0.10	$ 0.08	$ 1.23	$ 0.92	$ 10.26
Diluted earnings (loss) per share, in dollars per share	$ 0.40	$ 0.42	$ 0.17	$ 0.14	$ 0.43	$ 0.23	$ 0.10	$ 0.08	$ 1.12	$ 0.85	$ 9.25

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