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Acquisitions - Components of Acquired Intangible Assets on a Preliminary Basis (Detail) - Applied Micro Circuits Corporation $ in Thousands	12 Months Ended
	Sep. 27, 2019 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 412,848
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 78,448
Acquired intangible assets, Useful Lives (Years)	7 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 334,400
Acquired intangible assets, Useful Lives (Years)	14 years
Discontinued Operations, Held-for-sale [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 9,600
Discontinued Operations, Held-for-sale [Member] | Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	9,600
Discontinued Operations, Held-for-sale [Member] | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 0

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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