Income Taxes (Summary Of Changes In Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Gross Unrecognized Tax Benefits [Roll Forward]
Gross unrecognized tax benefits, beginning of year	$ 12,285	$ 12,285	$ 7,257
Increase due to tax positions taken during prior period	0	0	5,028
Gross unrecognized tax benefits, end of year	$ 12,285	$ 12,285	$ 12,285
Effective income tax rate before unrecognized tax benefits			32.30%
Effective income tax rate	34.02%	31.40%	32.72%