Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2019	Aug. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,195,210	$ 1,914,643	$ 2,087,500	$ 1,926,311
Cumulative effect of adoption of ASC 606	11,610		11,610
Net income	68,136	87,476	145,608	73,529
Dividends on common stock	(7,897)	(2,186)	$ (12,352)	(6,686)
Employee stock options/other (in shares)			(1,263,505)
Employee stock options/other	2,267	12,662	$ 18,729	17,433
Stock awards		0	0	0
Stock-based compensation	4,513	3,354	14,479	12,149
Tax payments associated with stock-based compensation awards			(3,345)	(6,787)
Ending balance	$ 2,262,229	$ 2,015,949	$ 2,262,229	$ 2,015,949
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	(120,350,000)	(118,397,000)	(119,196,000)	(117,946,000)
Beginning balance	$ 120,350	$ 118,397	$ 119,196	$ 117,946
Employee stock options/other (in shares)	(173,000)	(652,000)	(1,271,000)	(1,049,000)
Employee stock options/other	$ 173	$ 652	$ 1,271	$ 1,049
Stock awards (in shares)			(56,000)	(54,000)
Stock awards			$ 56	$ 54
Ending balance (in shares)	(120,523,000)	(119,049,000)	(120,523,000)	(119,049,000)
Ending balance	$ 120,523	$ 119,049	$ 120,523	$ 119,049
Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	775,693	736,047	753,570	727,483
Employee stock options/other	2,094	12,010	17,458	16,384
Stock awards		(1,157)	(3,207)	(5,762)
Stock-based compensation	4,513	3,354	14,479	12,149
Ending balance	782,300	750,254	782,300	750,254
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,981,795	1,717,248	1,897,168	1,735,695
Cumulative effect of adoption of ASC 606	11,610		11,610
Net income	68,136	87,476	145,608	73,529
Dividends on common stock	(7,897)	(2,186)	(12,352)	(6,686)
Ending balance	2,042,034	1,802,538	2,042,034	1,802,538
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(9,565)	(16,924)	(9,565)	(16,924)
Ending balance	$ (9,565)	$ (16,924)	$ (9,565)	$ (16,924)
Grantor Stock Ownership Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	(7,860,000)	(8,460,000)	(8,157,000)	(8,898,000)
Beginning balance	$ (85,246)	$ (91,760)	$ (88,472)	$ (96,509)
Stock awards (in shares)			(297,000)	(438,000)
Stock awards			$ 3,226	$ 4,749
Ending balance (in shares)	(7,860,000)	(8,460,000)	(7,860,000)	(8,460,000)
Ending balance	$ (85,246)	$ (91,760)	$ (85,246)	$ (91,760)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	(24,264,000)	(22,248,000)	(24,113,000)	(22,021,000)
Beginning balance	$ (587,817)	$ (548,365)	$ (584,397)	$ (541,380)
Stock awards (in shares)		47,000	(4,000)	37,000
Stock awards		$ 1,157	$ (75)	$ 959
Tax payments associated with stock-based compensation awards (in shares)			(147,000)	(217,000)
Tax payments associated with stock-based compensation awards			$ (3,345)	$ (6,787)
Ending balance (in shares)	(24,264,000)	(22,201,000)	(24,264,000)	(22,201,000)
Ending balance	$ (587,817)	$ (547,208)	$ (587,817)	$ (547,208)