Taxes on Earnings - Schedule of Income Taxes Paid (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Sep. 27, 2013
Income Taxes Paid Net [Line Items]
Income taxes paid	$ 119.8	$ 140.8	$ 203.4
Federal
Income Taxes Paid Net [Line Items]
Income taxes paid	57.1	66.2	119.1
State
Income Taxes Paid Net [Line Items]
Income taxes paid	7.2	7.3	14.9
Foreign
Income Taxes Paid Net [Line Items]
Income taxes paid	$ 55.5	$ 67.3	$ 69.4