Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 1,926,311
Net loss	$ 57,308	$ 31,782	(13,947)	$ 46,041
Dividends on common stock			$ (4,500)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)			397,062
Stock Issued During Period, Value, Stock Options Exercised			$ 4,771
Stock Issued During Period, Value, Share-based Compensation, Gross			0
Stock-based compensation			8,795
Stock repurchases			(6,787)
Ending balance	$ 1,914,643		$ 1,914,643
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding (in shares)			(117,946,000)
Beginning balance			$ 117,946
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)			397,000
Stock Issued During Period, Value, Stock Options Exercised			$ 397
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)			(54,000)
Stock Issued During Period, Value, Share-based Compensation, Gross			$ 54
Common Stock, Shares, Outstanding (in shares)	(118,397,000)		(118,397,000)
Ending balance	$ 118,397		$ 118,397
Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			727,483
Stock Issued During Period, Value, Stock Options Exercised			4,374
Stock Issued During Period, Value, Share-based Compensation, Gross			(4,605)
Stock-based compensation			8,795
Ending balance	736,047		736,047
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,735,695
Net loss			(13,947)
Dividends on common stock			(4,500)
Ending balance	1,717,248		1,717,248
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(16,924)
Ending balance	$ (16,924)		$ (16,924)
Grantor Stock Ownership Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding (in shares)			(8,898,000)
Beginning balance			$ (96,509)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)			(438,000)
Stock Issued During Period, Value, Share-based Compensation, Gross			$ 4,749
Common Stock, Shares, Outstanding (in shares)	(8,460,000)		(8,460,000)
Ending balance	$ (91,760)		$ (91,760)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding (in shares)			(22,021,000)
Beginning balance			$ (541,380)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares)			(10,000)
Stock Issued During Period, Value, Share-based Compensation, Gross			$ (198)
Stock repurchases			$ (6,787)
Common stock repurchased (in shares)			(217,000)
Common Stock, Shares, Outstanding (in shares)	(22,248,000)		(22,248,000)
Ending balance	$ (548,365)		$ (548,365)