Income Taxes (Income Tax Benefit (Provision) (Details) - USD ($) $ in Thousands		3 Months Ended
		Feb. 28, 2018	Feb. 28, 2017
Income Tax Disclosure [Abstract]
Write down of deferred tax asset resulting from Tax Cuts and Jobs Act		$ 68,600
Provision for income taxes (1)	[1]	$ (132,611)	$ (19,969)
Effective tax rate		49.30%	34.40%
Effective tax rate, including impact of Tax Cuts and Jobs Act		23.80%

[1] Provision for income taxes for the three months ended February 28, 2018 includes a non-cash one-time write down of deferred tax assets of $68.6 million resulting from the Tax Cuts and Jobs Act enacted in December 2017.