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Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 30, 2016 | Jan. 01, 2016 | Mar. 31, 2017
Other Non-current Assets |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Restricted investments | $ 7.7 |  |  | $ 7.7
Employee loans receivable | 2.2 |  |  | 2.2
Selling, General and Administrative Expense |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
One-time, non-cash benefit | $ 9.9 |  |  | $ 9.9
Goodwill Adjustment |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Overstatement adjustment of financial statements line item |  | $ 209.9 |  |
Accumulated Other Comprehensive Income Adjustment |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Overstatement adjustment of financial statements line item |  | 209.9 |  |
Overall Translation Adjustment |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Overstatement adjustment of financial statements line item |  | $ 287.5 |  |
Other Comprehensive Income Adjustment |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Overstatement adjustment of financial statements line item |  |  | $ 18.4 |

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