Nature of Business and Summary of Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	$ 522,464	$ 543,245	$ 513,654
Total other comprehensive (loss) income, net of tax	(3,933)	(10,902)	(2,067)
Balance, end of year	406,629	522,464	543,245
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(24,582)	(13,733)
Other comprehensive (loss) before reclassifications	(3,843)	(10,849)
Total other comprehensive (loss) income, net of tax	(3,843)	(10,849)
Balance, end of year	(28,425)	(24,582)	(13,733)
Unrealized Gains (Losses) on Investments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(46)	7
Other comprehensive (loss) before reclassifications	(90)	(53)
Total other comprehensive (loss) income, net of tax	(90)	(53)
Balance, end of year	(136)	(46)	7
Total [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(24,628)	(13,726)	(11,659)
Other comprehensive (loss) before reclassifications	(3,933)	(10,902)
Total other comprehensive (loss) income, net of tax	(3,933)	(10,902)	(2,067)
Balance, end of year	$ (28,561)	$ (24,628)	$ (13,726)