Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015	Nov. 30, 2015
Income Tax Disclosure [Abstract]
Income tax expense	$ (9,200,000)	$ (3,100,000)	$ (12,100,000)	$ (5,800,000)
Income Tax Credits and Adjustments	400,000	$ 1,700,000	3,700,000	$ 3,100,000
Unrecognized Tax Benefits	100,000		100,000		$ 100,000
Gross Unrecognized Tax Benefits Including Interest and Penalties	100,000		100,000		100,000
Net (increase) reduction in valuation allowance	0		0
Valuation allowance	37,800,000		37,800,000		37,800,000
Income Tax Contingency [Line Items]
Deferred Tax Assets, Gross	$ 808,200,000		$ 808,200,000		$ 820,000,000
Effective Income Tax Rate Reconciliation, Percent	37.10%	24.50%	29.60%	25.00%
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