Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 84,643	$ 918,349	$ 39,963
Net actuarial gain (loss) arising during the period	3,745	(3,801)	7,083
Amortization of net actuarial loss	848	357	1,803
Amortization of prior service cost	1,556	1,556	1,556
Other comprehensive income (loss) before tax	6,149	(1,888)	10,442
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
Comprehensive income	$ 88,332	$ 914,857	$ 50,405