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SEGMENT INFORMATION Sales by country (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 03, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 177,688	$ 150,450	$ 150,741	$ 144,297	$ 139,827	$ 127,109	$ 115,908	$ 157,208	$ 623,176	$ 540,052	$ 889,121
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									321,294	252,179	408,567
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									64,373	63,440	126,676
HONG KONG
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									43,288	12,096	14,194
Malaysia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									40,641	41,568	65,354
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									36,186	36,393	68,774
KOREA, REPUBLIC OF
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									30,848	15,236	38,551
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									14,944	25,680	19,648
Philippines [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									9,439	12,057	26,372
THAILAND
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									9,389	9,941	17,051
JAPAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									9,150	10,341	12,978
All Other Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 43,624	$ 61,121	$ 90,956

X

- 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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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