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Condendsed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 11,100	$ 31,118
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	149	(445)
Unrealized gains on investments, net of tax provision of $131 and $48 in 2014 and 2013, respectively	225	82
Total other comprehensive income (loss), net of tax	374	(363)
Comprehensive income	$ 11,474	$ 30,755

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