Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 01, 2016	Apr. 03, 2015	Apr. 01, 2016	Apr. 03, 2015
Income Tax Disclosure [Abstract]
Effective tax rate	18.40%	24.50%	16.30%	22.70%
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Tax Adjustments, Settlements, and Unusual Provisions			$ (2.6)
Benefit To Tax Expense Resulting From Reversal of Uncertain Tax Positions from Audit Settlement			24.0
Research and development tax credit	$ 10.2	$ 7.0	$ 10.2	$ 7.0