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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, 2013	Nov. 30, 2012	Nov. 30, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowances Beginning Balance	$ 5,606	$ 5,868	$ 5,729
Charged Against Revenue	674	1,343	650
Charged to Expenses	412	559	100
Write-offs, Adjustments, Net of Recovery	(1,547)	(2,164)	(611)
Allowances Ending Balance	$ 5,145	$ 5,606	$ 5,868

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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