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Accounts Receivable and Allowances for Doubtful Accounts, Returns and Discounts (Summary Of Activities In Allowances for Doubtful Accounts, Returns and Discounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowances Beginning Balance	$ 5,868	$ 5,729	$ 4,224
Charged Against Revenue	1,343	650	200
Charged to Expenses	559	100	0
Write-offs, Adjustments, Net of Recovery	(2,164)	(611)	1,305
Allowances Ending Balance	$ 5,606	$ 5,868	$ 5,729

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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