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Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 105,615	$ 84,643	$ 918,349
Net actuarial gain (loss) arising during the period	468	3,745	(3,801)
Amortization of net actuarial loss	79	848	357
Amortization of prior service cost	1,556	1,556	1,556
Other comprehensive income (loss) before tax	2,103	6,149	(1,888)
Income tax expense related to items of other comprehensive income	(841)	(2,460)	(1,604)
Other comprehensive income (loss), net of tax	1,262	3,689	(3,492)
Comprehensive income	$ 106,877	$ 88,332	$ 914,857

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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