Stockholders' Equity (Narratives) (Details) (USD $)	0 Months Ended	3 Months Ended						9 Months Ended			0 Months Ended
	Jan. 29, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Aug. 31, 2013	Aug. 31, 2012	Jan. 29, 2013 Convertible senior notes due February 1, 2019 at 1.375%	Jul. 18, 2013 Director Stock Units [Domain]
Equity [Abstract]
Stock issued during period, shares	6,325,000
Common stock, par value per share	$ 1.00
Treasury stock acquired, average cost per share	$ 18.25
Stock issued during period, shares, treasury stock reissued	6,325,000
Proceeds from issuance of common stock, net	$ 109,500,000							$ 109,503,000	$ 0
Common stock reserve, shares		12,602,735						12,602,735
Dividend paid in each quarter (in dollars per share)		$ 0.0250	$ 0.0250	$ 0.0250	$ 0.0250	$ 0.025	$ 0.0625	$ 0.0750	$ 0.1125
Debt Instrument [Line Items]
Debt instrument, face amount										230,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number											481,554
Number of common stock, authorized, approved under a board approved stock repurchase program		4,000,000						4,000,000			482,000
Stock Issued During Period, Shares, Issued for Cash											478,294
Treasury Stock, Value, Acquired, Cost Method								$ 7,967,000			$ 7,900,000