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Basis of Presentation (Details) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 29, 2018 USD ($) Segment | Dec. 30, 2017 USD ($) | Oct. 01, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Number of operating segments | Segment | 2 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 1,321,169 | $ 889,099 |  | $ 874,589 | $ 885,436
Deferred tax assets | 201,149 |  |  | 165,566 |
Other income (expense), net | 655 | (798) |  |  |
Accounting Standards Update 2016-16 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred tax assets |  |  | $ 75,300 |  |
Other Tax Assets |  |  | 6,000 |  |
Other Tax Liabilities |  |  | 3,000 |  |
Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other income (expense), net | 200 |  |  |  |
Accumulated Deficit |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Parent | (138,785) | $ (637,519) |  | (599,409) | $ (650,840)
Accumulated Deficit | Accounting Standards Update 2016-16 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Parent |  |  | $ 72,300 |  |
Other Current Assets |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Restricted Cash | $ 1,100 |  |  | $ 1,100 |

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