Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 29, 2013
Income Tax Disclosure [Abstract]
Federal	$ 0.0	$ 0.0	$ 0.8
State	0.2	0.3	0.8
Foreign	4.2	3.9	3.1
Federal	4.6	(6.5)	2.3
State	0.0	(0.2)	1.4
Foreign	3.3	3.3	4.0
Income Tax Expense (Benefit)	$ 12.3	$ 0.8	$ 12.4