Income Taxes (Details) - USD ($)	3 Months Ended			9 Months Ended
	Aug. 31, 2015	Nov. 30, 2014	Aug. 31, 2014	Aug. 31, 2015	Aug. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ (10,700,000)		$ (300,000)	$ (16,500,000)	$ (800,000)
Income Tax Credits and Adjustments	2,500,000			5,600,000
Unrecognized Tax Benefits	100,000	$ 100,000		100,000
Gross Unrecognized Tax Benefits Including Interest and Penalties	100,000	300,000		100,000
Net (increase) reduction in valuation allowance	0	(825,200,000)		0
Valuation allowance	41,200,000	41,200,000		41,200,000
Income Tax Contingency [Line Items]
Deferred Tax Assets, Gross	$ 851,200,000	$ 866,400,000		$ 851,200,000
Effective Income Tax Rate Reconciliation, Percent	31.50%			28.90%
Minimum [Member]
Income Tax Contingency [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 0			$ 0
Maximum [Member]
Income Tax Contingency [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 100,000			$ 100,000