Income Taxes (Income Tax Benefit (Provision) (Details) - USD ($) $ in Thousands		3 Months Ended
		Feb. 28, 2019	Feb. 28, 2018
Income Tax Disclosure [Abstract]
Benefit (provision) for income taxes	[1]	$ 79,700	$ 132,611
Effective tax rate		24.90%	49.30%
Write down of deferred tax asset resulting from Tax Cuts and Jobs Act			$ 68,600
Excluding impact of write down of deferred tax assets, percent			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.