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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, 2011	Nov. 30, 2010	Nov. 30, 2009
Accounts Receivable And Allowances For Doubtful Accounts, Returns And Discounts [Abstract]
Allowances Beginning Balance	$ 5,729	$ 4,224	$ 4,369
Charged Against Revenue	650	200	650
Charged to Expenses	100		350
Write-offs, Adjustments, Net of Recovery	(611)	1,305	(1,145)
Allowances Ending Balance	$ 5,868	$ 5,729	$ 4,224

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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