Line of Credit (Details) (USD $)	12 Months Ended									0 Months Ended		0 Months Ended		0 Months Ended
	Nov. 30, 2013	Nov. 30, 2013 Minimum [Member]	Nov. 30, 2013 Maximum [Member]	Nov. 30, 2013 Libor Rate [Member] Minimum [Member]	Nov. 30, 2013 Libor Rate [Member] Maximum [Member]	Nov. 30, 2013 Base Rate [Member] Minimum [Member]	Nov. 30, 2013 Base Rate [Member] Maximum [Member]	Nov. 30, 2013 Federal Funds Rate [Member]	Nov. 30, 2013 One Month Libor Rate [Member]	Aug. 15, 2011 Revolving Credit Facility Member [Member]	Nov. 30, 2013 Revolving Credit Facility Member [Member]	Aug. 15, 2011 Standby letters of credit [Member]	Nov. 30, 2013 Standby letters of credit [Member]	Aug. 15, 2011 Swing line loans [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date	Aug. 15, 2016
Unsecured credit facility										$ 150,000,000.0
Additional borrowing capacity										75,000,000.0		25,000,000.0		20,000,000.0
Basis spread on variable rate				1.25%	1.75%	0.25%	0.75%	0.50%	1.00%
Commitment fee percentage		0.25%	0.35%
Debt term	5 years
Debt covenant compliance, minimum cash and cash equivalents	100,000,000.0
Leverage Ratio	3
Interest Coverage Ratio	3
Line of credit facility outstanding amount											0
Letters of credit outstanding amount													$ 800,000