Pensions and Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Service costs incurred	$ 391	$ 494	$ 782	$ 989
Interest costs on projected benefit obligation	2,077	2,070	4,149	4,147
Expected return on plan assets	(2,158)	(2,168)	(4,310)	(4,345)
Net periodic pension expense	310	396	621	791
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Service costs incurred	2	4	4	8
Interest costs on projected benefit obligation	94	97	188	194
Net periodic pension expense	$ 96	$ 101	$ 192	$ 202