Earnings Per Share (Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021
Numerator:
Net income	$ 255,329	$ 150,097	$ 600,256	$ 390,512
Less: Distributed earnings allocated to nonvested restricted stock	(62)	(62)	(190)	(188)
Less: Undistributed earnings allocated to nonvested restricted stock	(1,150)	(625)	(2,685)	(1,594)
Numerator for basic earnings per share	254,117	149,410	597,381	388,730
Add: Undistributed earnings allocated to nonvested restricted stock	1,150	625	2,685	1,594
Less: Undistributed earnings reallocated to nonvested restricted stock	(1,119)	(604)	(2,610)	(1,540)
Numerator for diluted earnings per share	$ 254,148	$ 149,431	$ 597,456	$ 388,784
Denominator:
Weighted average shares outstanding — basic (in shares)	86,487	90,076	87,538	91,290
Effect of dilutive securities: Share-based payments (in shares)	2,370	3,188	2,537	3,222
Weighted average shares outstanding — diluted (in shares)	88,857	93,264	90,075	94,512
Basic earnings (loss) per share (in dollars per share)	$ 2.94	$ 1.66	$ 6.82	$ 4.26
Diluted earnings (loss) per share (in dollars per share)	$ 2.86	$ 1.60	$ 6.63	$ 4.11
Antidilutive securities excluded from computation of earnings per share (in shares)	0	0	0	0