Financing Receivables and Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified	Dec. 27, 2013	Sep. 27, 2013
Financing Receivables [Line Items]
Accounts receivable with contractual maturities of more than one year, Gross amount	$ 38.7	$ 28.0
Accounts receivable with contractual maturities of more than one year, Allowance for doubtful accounts	(3.0)	(3.0)
Accounts receivable with contractual maturities of more than one year, Net amount	35.7	25.0
Accounts receivable with contractual maturities of more than one year, Amount past due	$ 3.0	$ 3.1