Accumulated Other Comprehensive Loss (Changes in the balances of each component of accumulated other comprehensive loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2014		Nov. 30, 2013		Nov. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (17,516)
Net actuarial gain (loss) arising during the period	(3,801)		7,083		(4,765)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,913	[1]	3,359	[1]	2,959	[1]
Income tax expense related to items of other comprehensive income	(1,604)		0		0
Other comprehensive income (loss), net of tax	(3,492)		10,442		(1,806)
Ending Balance	(21,008)		(17,516)
Accumulated Define Benefit Plans Adjustment Member
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(17,516)		(27,958)
Net actuarial gain (loss) arising during the period	(3,801)		7,083
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,913		3,359
Income tax expense related to items of other comprehensive income	(1,604)
Other comprehensive income (loss), net of tax	(3,492)		10,442
Ending Balance	$ (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.