Accounts Receivable and Allowances for Doubtful Accounts, Returns and Discounts (Schedule Of Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Accounts Receivable And Allowances For Doubtful Accounts, Returns And Discounts [Abstract]
Accounts receivable	$ 214,804	$ 220,286
Unbilled fees for professional services	21,535	19,420
Gross accounts receivable	236,339	239,706
Less: Allowances for doubtful accounts, returns and discounts	(5,145)	(5,606)	(5,868)	(5,729)
Net accounts receivable	$ 231,194	$ 234,100