Accumulated Other Comprehensive Loss (Amounts reclassified from accumulated other comprehensive loss) (Details) (USD $)	12 Months Ended
	Nov. 30, 2014		Nov. 30, 2013		Nov. 30, 2012
Equity [Abstract]
Amortization of net actuarial loss	$ 357,000		$ 1,803,000		$ 1,403,000
Amortization of prior service cost	1,556,000		1,556,000		1,556,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(1,913,000)	[1]	(3,359,000)	[1]	(2,959,000)	[1]
Defined Benefit Plan, Future Amortization of Gain (Loss)	800,000
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)	$ 1,600,000

[1] The accumulated other comprehensive loss components are included in the computation of net periodic benefit costs as further discussed in Note 20. Postretirement Benefits.