Fair Value Measurements - Changes in Fair Value of Recurring Fair Value Measurements Using Significant Unobservable Inputs (Level 3), Consisting of Contingent Consideration Liabilities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 3.4	$ 3.6	$ 3.8	$ 86.4
Contingent consideration recorded at acquisition	0	0.5	0	0.5
Fair value adjustments	0	0.5	0	11.3
Payments	(0.3)	(0.1)	(0.7)	(93.7)
Balance at end of period	$ 3.1	$ 4.5	$ 3.1	$ 4.5