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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 27, 2016	Dec. 27, 2015	Dec. 28, 2014	Mar. 27, 2016	Mar. 29, 2015
Income Taxes
Effective tax rate (as a percent)				38.20%	29.60%
Acquisition and integration expenses and debt pre-payment fees	$ 13.3
Income tax benefit on business combination acquisition and integration expenses and debt pre-payment fees	0.0
Business combination acquisition related expenses	6.4
Business combination integration costs and debt pre-payment fees	6.9
R&E credits		$ 2.0	$ 1.2
Undistributed earnings of foreign subsidiaries	55.0			$ 55.0
Incremental federal tax due to repatriation of foreign earnings				$ 5.6
Represents the period of projected cumulative pre-tax losses in certain foreign jurisdictions				36 months
Loss carry-forwards in foreign jurisdictions, valuation allowance	$ 8.7			$ 8.7
Effective income tax rate excluding R&E credits, acquisition expenses and debt pre-payment fees (as a percent)				32.70%	31.50%

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Amount of business combination acquisition and integration and debt pre-payment fees.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible business combination acquisition related expenses.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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