Balance Sheet Accounts and Supplemental Disclosures - Estimated Amounts that will be Amortized from Accumulated Other Comprehensive Loss (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Actuarial losses (gains), net	$ (173.5)	$ 245.7	$ 81.1
Prior service credits, net	0.9	0.1	(0.1)
Net periodic benefit expense	(91.3)	(58.9)	(62.8)
Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Actuarial losses (gains), net	53.8
Net periodic benefit expense	53.8
Medical and Life Insurance Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Actuarial losses (gains), net		(2.9)
Prior service credits, net		(0.9)
Net periodic benefit expense		$ (3.8)