Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,490,354	$ 2,195,210	$ 2,383,122	$ 2,087,500
Net income	78,415	68,136	190,152	145,608
Dividends on common stock	(8,097)	(7,897)	$ (24,428)	(12,352)
Employee stock options/other (in shares)			(708,372)
Employee stock options/other	0	2,267	$ 8,404	18,729
Stock awards			0	0
Stock-based compensation	4,636	4,513	12,767	14,479
Tax payments associated with stock-based compensation awards			(6,219)	(3,345)
Ending balance	$ 2,565,308	$ 2,262,229	$ 2,565,308	$ 2,262,229
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	(122,370,000)	(120,350,000)	(121,593,000)	(119,196,000)
Beginning balance	$ 122,370	$ 120,350	$ 121,593	$ 119,196
Employee stock options/other (in shares)	0	(173,000)	(709,000)	(1,271,000)
Employee stock options/other	$ 0	$ 173	$ 709	$ 1,271
Stock awards (in shares)			(68,000)	(56,000)
Stock awards			$ 68	$ 56
Ending balance (in shares)	(122,370,000)	(120,523,000)	(122,370,000)	(120,523,000)
Ending balance	$ 122,370	$ 120,523	$ 122,370	$ 120,523
Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	806,700	775,693	793,954	753,570
Employee stock options/other	(421)	2,094	7,274	17,458
Stock awards			(3,080)	(3,207)
Stock-based compensation	4,636	4,513	12,767	14,479
Ending balance	810,915	782,300	810,915	782,300
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,255,742	1,981,795	2,157,183	1,897,168
Net income	78,415	68,136	190,152	145,608
Dividends on common stock	(8,097)	(7,897)	(24,428)	(12,352)
Ending balance	2,326,060	2,042,034	2,326,060	2,042,034
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(17,149)	(9,565)	(15,506)	(9,565)
Ending balance	$ (17,149)	$ (9,565)	$ (17,149)	$ (9,565)
Grantor Stock Ownership Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	(7,317,000)	(7,860,000)	(7,631,000)	8,157,000
Beginning balance	$ (79,359)	$ (85,246)	$ (82,758)	$ (88,472)
Stock awards (in shares)			(314,000)	(297,000)
Stock awards			$ 3,399	$ 3,226
Ending balance (in shares)	(7,317,000)	(7,860,000)	(7,317,000)	(7,860,000)
Ending balance	$ (79,359)	$ (85,246)	$ (79,359)	$ (85,246)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	(24,526,000)	(24,264,000)	(24,356,000)	24,113,000
Beginning balance	$ (597,950)	$ (587,817)	$ (591,344)	$ (584,397)
Employee stock options/other (in shares)	(17,000)		(17,000)
Employee stock options/other	$ 421		$ 421
Stock awards (in shares)			(15,000)	(4,000)
Stock awards			$ (387)	$ (75)
Tax payments associated with stock-based compensation awards (in shares)			(155,000)	(147,000)
Tax payments associated with stock-based compensation awards			$ (6,219)	$ (3,345)
Ending balance (in shares)	(24,509,000)	(24,264,000)	(24,509,000)	(24,264,000)
Ending balance	$ (597,529)	$ (587,817)	$ (597,529)	$ (587,817)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-02 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,510
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,510
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-02 [Member] | Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,643
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ (1,643)