Retirement Benefits - Summary of Company's Pension Benefits and Medical and Life Insurance Benefits Footnote (Details) (USD $)	12 Months Ended
	Nov. 30, 2014		Nov. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Pension benefit obligation, non-qualified plan	$ 20,400,000		$ 18,500,000
Medicare Part D Subsidy [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid for medical and life benefits	200,000		400,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid for medical and life benefits	134,100,000	[1]	136,100,000	[1]
Pension plan, lump sum present value, less than	$ 25,000

[1] Benefits paid for medical and life insurance benefits are net of the Medicare Part D Subsidy of $0.2 million and $0.4 million received in fiscal 2014 and 2013, respectively.