Basis of Presentation and Significant Accounting Policies (Narratives) (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013	Nov. 30, 2013	Jan. 29, 2013 Convertible Notes Payable [Member] Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						1.375%
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5.2		5.2
Cash equivalents	$ 357,200,000		$ 357,200,000		$ 436,200,000
Restricted cash	44,237,000		44,237,000		41,906,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 26,600,000	$ (3,000,000)	$ 37,200,000	$ (15,400,000)