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Basis of Presentation (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 29, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 29, 2019 USD ($) Segment | Jun. 30, 2018 USD ($) | Mar. 30, 2019 USD ($) | Oct. 01, 2018 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | 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 | $ 1,215,595 | $ 834,385 | $ 1,215,595 | $ 834,385 | $ 1,247,708 |  | $ 874,589 | $ 927,724 | $ 885,436
Deferred tax assets | 189,371 |  | 189,371 |  |  |  | 165,566 |  |
Other income (expense), net | 1,026 | (930) | 2,501 | (2,013) |  |  |  |  |
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 |  | 500 |  |  |  |  |
Accumulated Deficit |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (197,056) | $ (612,600) | (197,056) | $ (612,600) | $ (182,298) |  | (599,409) | $ (629,597) | $ (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 |  |  |  | $ 1,100 |  |

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