Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Income Tax Disclosure [Abstract]
State	$ 0.2	$ 0.2	$ 0.3
Foreign	4.3	4.2	3.9
Federal	4.1	4.6	(6.5)
State	0.2	0.0	(0.2)
Foreign	(1.6)	3.3	3.3
Income Tax Expense (Benefit)	$ 7.2	$ 12.3	$ 0.8