Postretirement Benefits (Net Periodic Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Retirement Benefits [Abstract]
Interest cost	$ 1,593	$ 1,950	$ 2,478
Amortization of prior service cost	85	425	1,556
Service cost	1,152	1,077	958
Amortization of net actuarial loss	1,443	912	218
Settlement loss	0	0	356
Total	$ 4,273	$ 4,364	$ 5,566