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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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Finite-lived intangible assets, placed in service.

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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+ References

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