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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Apr. 01, 2016 | Mar. 31, 2017 | Apr. 01, 2016
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (percent) | 27.00% | 29.90% | 28.10% | 23.30%
Income tax benefit | $ 16,326 | $ 27,067 | $ 41,053 | $ 34,548
Release of valuation allowance |  |  |  | $ 11,200
Decrease in uncertain tax positions |  |  | 10,000 |
Foreign Affiliate |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax benefit | 3,300 |  |  |
IRS Audit |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax benefit | 1,900 |  |  |
Foreign Country |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Reversal of accrued interest expense | 2,700 |  | 2,700 |
Reversal of accrued penalties | $ 5,100 |  | $ 5,100 |

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