Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 268,775	$ 170,365	$ 180,595
Net actuarial gain (loss) arising during the period	(10,268)	8,216	(3,143)
Amortization of net actuarial loss	218	336	142
Amortization of prior service cost	1,556	1,556	1,556
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	356	0	0
Other comprehensive income (loss) before tax	(8,138)	10,108	(1,445)
Income tax benefit (expense) related to items of other comprehensive income (loss)	2,197	(2,749)	578
Other comprehensive income (loss), net of tax	(5,941)	7,359	(867)
Comprehensive income	$ 262,834	$ 177,724	$ 179,728