Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012	Nov. 30, 2012
Income Tax Disclosure [Abstract]
Income tax benefit	$ 1,200,000	$ 4,500,000	$ 1,100,000	$ 4,100,000
Income Taxes Receivable, Current	1,400,000		1,400,000
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority		4,100,000		4,100,000
Net Increase (reduction) in valuation allowance	300,000	9,700,000	(400,000)	28,000,000
Net deferred tax assets	0		0		0
Valuation allowance	879,700,000		879,700,000		880,100,000
Additions to gross unrecognized tax benefits	100,000.0		100,000.0
Total amount of unrecognized tax benefits, including interest and penalties	1,300,000		1,300,000
Minimum [Member]
Income Tax Contingency [Line Items]
Anticipated decrease in unrecognized tax benefit during 12 months following current reporting date	400,000		400,000
Maximum [Member]
Income Tax Contingency [Line Items]
Anticipated decrease in unrecognized tax benefit during 12 months following current reporting date	$ 1,300,000		$ 1,300,000