Financing Receivables and Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified	Jun. 27, 2014	Sep. 27, 2013
Financing Receivables [Line Items]
Accounts receivable with contractual maturities of more than one year, Gross amount	$ 41.3	$ 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	38.3	25.0
Accounts receivable with contractual maturities of more than one year, Amount past due	$ 3.5	$ 3.1