Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2013		Nov. 30, 2012		Nov. 30, 2011
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance beginning of period	$ 1,000		$ 1,000		$ 1,200
Additions charged to costs and expenses	382		341		132
Deductions	382	[1]	341	[1]	332	[1]
Balance at end of period	$ 1,000		$ 1,000		$ 1,000

[1] Uncollectible accounts written off, net of recoveries.