Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2012
Statement of Comprehensive Income [Abstract]
Net Income	$ 49,458us-gaap_NetIncomeLoss	$ 74,907us-gaap_NetIncomeLoss	$ 47,444us-gaap_NetIncomeLoss
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(4,484)	(1,066)	(638)
Unrealized gain on investments, net of tax provision of $1,400 in 2014, $99 in 2013 and $527 in 2012	2,417	171	1,527
Total other comprehensive (loss) income, net of tax	(2,067)	(895)	889
Comprehensive income	$ 47,391us-gaap_ComprehensiveIncomeNetOfTax	$ 74,012us-gaap_ComprehensiveIncomeNetOfTax	$ 48,333us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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