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Derivative Financial Instruments - Summary of Gain (Loss) Recognized in Income on Oil and Gas Commodity Contracts on (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Loss on oil and natural gas commodity contracts	$ (37.0)	$ 27.4	$ 36.0	$ 38.7
Commodity contracts [Member] \| Other Income Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash settlements on derivative financial instruments	0.6		0.6
Non-cash change in fair value of derivative financial instruments	(9.4)		(9.4)
Loss on oil and natural gas commodity contracts	$ (8.8)	$ 0	$ (8.8)	$ 0

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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