Accumulated Other Comprehensive Loss (Amounts reclassified from accumulated other comprehensive loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of net actuarial loss		$ 79	$ 848	$ 357
Amortization of prior service cost		1,556	1,556	1,556
Total reclassifications	[1]	1,635	$ 2,404	$ 1,913
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)		100
Defined Benefit Plan, Future Amortization of Gain (Loss)		$ 1,600

[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.