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, 2023	Aug. 31, 2022	Aug. 31, 2023	Aug. 31, 2022
Numerator:
Net income	$ 149,933	$ 255,329	$ 439,875	$ 600,256
Less: Distributed earnings allocated to nonvested restricted stock	(120)	(62)	(295)	(190)
Less: Undistributed earnings allocated to nonvested restricted stock	(998)	(1,150)	(2,851)	(2,685)
Numerator for basic earnings per share	148,815	254,117	436,729	597,381
Add: Undistributed earnings allocated to nonvested restricted stock	998	1,150	2,851	2,685
Less: Undistributed earnings reallocated to nonvested restricted stock	(967)	(1,119)	(2,766)	(2,610)
Numerator for diluted earnings per share	$ 148,846	$ 254,148	$ 436,814	$ 597,456
Denominator:
Weighted average shares outstanding — basic (in shares)	80,175	86,487	81,790	87,538
Effect of dilutive securities: Share-based payments (in shares)	2,557	2,370	2,542	2,537
Weighted average shares outstanding — diluted (in shares)	82,732	88,857	84,332	90,075
Basic earnings per share (in dollars per share)	$ 1.86	$ 2.94	$ 5.34	$ 6.82
Diluted earnings per share (in dollars per share)	$ 1.80	$ 2.86	$ 5.18	$ 6.63
Antidilutive securities excluded from computation of earnings per share (in shares)	0	0	0	0