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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 112,248	$ 108,306	$ 128,465	$ 150,689	$ 151,187	$ 137,872	$ 150,414	$ 130,925	$ 499,708	$ 570,398	$ 698,772
United States
Disaggregation of Revenue [Line Items]
Revenues									239,510	272,951	265,038
China
Disaggregation of Revenue [Line Items]
Revenues									132,329	159,763	206,136
Asia Pacific, excluding China
Disaggregation of Revenue [Line Items]
Revenues									80,136	79,581	170,826
Other Countries
Disaggregation of Revenue [Line Items]
Revenues									47,733	58,103	56,772
Telecom
Disaggregation of Revenue [Line Items]
Revenues									180,938	222,940	340,022
Data Center
Disaggregation of Revenue [Line Items]
Revenues									114,132	162,098	172,481
Industrial & Defense
Disaggregation of Revenue [Line Items]
Revenues									$ 204,638	$ 185,360	$ 186,269

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 22
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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