Financing Receivables and Allowance for Credit Losses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 29, 2013	Mar. 30, 2012	Mar. 29, 2013	Mar. 30, 2012
Financing Receivables [Line Items]
Accounts receivable with contractual maturities of more than one year, amount sold	$ 0.5	$ 2.3	$ 1.1	$ 7.5