Condensed Consolidated Statements of Comprehensive (Loss) Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
Feb. 28, 2015	Feb. 28, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (971)us-gaap_NetIncomeLoss	$ 11,100us-gaap_NetIncomeLoss
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(5,478)	149
Unrealized (losses) gains on investments, net of tax provision of $0 and $131 in 2015 and 2014, respectively	(2)	225
Total other comprehensive (loss) income, net of tax	(5,480)	374
Comprehensive (loss) income	$ (6,451)us-gaap_ComprehensiveIncomeNetOfTax	$ 11,474us-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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