Accumulated Other Comprehensive Loss (Changes in the balances of each component of accumulated other comprehensive loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		$ (21,008)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	2,404	$ 1,913	$ 3,359
Income tax expense related to items of other comprehensive income		(2,460)	(1,604)	0
Other comprehensive income (loss), net of tax		3,689	(3,492)	10,442
Ending Balance		(17,319)	(21,008)
Accumulated Define Benefit Plans Adjustment Member
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		(21,008)	(17,516)
Net actuarial gain (loss) arising during the period		3,745	(3,801)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		2,404	1,913
Income tax expense related to items of other comprehensive income		(2,460)	(1,604)
Other comprehensive income (loss), net of tax		3,689	(3,492)
Ending Balance		$ (17,319)	$ (21,008)	$ (17,516)

[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.