Postretirement Benefits (Details) (USD $)	12 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2012
Postretirement Benefits Additional (Textual) [Abstract]
Net periodic benefit cost	$ 5,600,000	$ 6,900,000	$ 6,600,000
Service cost	1,100,000	1,500,000	1,300,000
Interest cost	2,500,000	2,000,000	2,300,000
Amortization of unrecognized loss cost	(357,000)	(1,803,000)	(1,403,000)
Amortization of prior service cost	1,556,000	1,556,000	1,556,000
Liabilities related to postretirement benefit plan	62,600,000	56,300,000
Discounted rate for benefit plan	3.50%	4.40%
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of insurance contracts	70,571,000	68,534,000
2014	1,600,000
2015	1,800,000
2016	2,000,000
2017	2,800,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	3,300,000
2018 - 2022	19,000,000
Supplemental Nonqualified Unfunded Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)	1,800,000	3,100,000	4,200,000
Benefits paid	1,200,000	1,100,000	500,000
Cash surrender value of insurance contracts	48,100,000	47,400,000
Unfunded Death Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)	700,000	1,400,000	1,100,000
Cash surrender value of insurance contracts	$ 17,100,000	$ 16,200,000