Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 170,365	$ 180,595	$ 105,615
Net actuarial gain (loss) arising during the period	8,216	(3,143)	468
Amortization of net actuarial loss	336	142	79
Amortization of prior service cost	1,556	1,556	1,556
Other comprehensive income (loss) before tax	10,108	(1,445)	2,103
Income tax benefit (expense) related to items of other comprehensive income (loss)	(2,749)	578	(841)
Other comprehensive income (loss), net of tax	7,359	(867)	1,262
Comprehensive income	$ 177,724	$ 179,728	$ 106,877