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Retirement Benefits - Summary of Company's Pension Benefits and Medical and Life Insurance Benefits (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Pension benefit obligation, non-qualified plan	$ 18.5	$ 20.1
Medicare Part D Subsidy [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Benefits paid for medical and life benefits	$ 0.4	$ 0.4

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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