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Impairments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 29, 2019 | Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment charges |  | $ 264,786 | $ 6,575 | $ 4,352
Impairments of intangible assets |  | 344,625 |  |
Customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of intangible assets | $ 217,500 |  |  |
Impairments of intangible assets |  | 272,364 |  |
Technology-Based Intangible Assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of intangible assets | 33,200 |  |  |
Developed technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairments of intangible assets |  | $ 72,261 |  |
Placed in service |  |  |  | 3,600
2019 Restructuring Plan | Customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of intangible assets | 2,400 |  |  |
2019 Restructuring Plan | Technology-Based Intangible Assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of intangible assets | 3,900 |  |  |
Zhongxing Telecommunications Equipment Corporation |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Tangible asset impairment charges |  |  | $ 6,600 |
Construction in process |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Tangible asset impairment charges | $ 7,800 |  |  |
In-process research and development |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairments of intangible assets |  |  |  | $ 4,400

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