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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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- Definition 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 deduction of business combination and integration and debt pre-payment fees. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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