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SEGMENT INFORMATION (Operating information by segment) (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
Net revenue:
Net revenue	$ 177,688	$ 150,450	$ 150,741	$ 144,297	$ 139,827	$ 127,109	$ 115,908	$ 157,208	$ 623,176	$ 540,052	$ 889,121
Income from operations:
Income from operations	$ 23,048	$ 10,971	$ 11,076	$ 13,414	$ 7,693	$ 1,827	$ (2,465)	$ 14,555	58,509	21,610	166,632
Capital Equipment
Net revenue:
Net revenue									462,059	386,820	719,390
Income from operations:
Income from operations									22,069	(12,577)	132,563
APS [Member]
Net revenue:
Net revenue									161,117	153,232	169,731
Income from operations:
Income from operations									$ 36,440	$ 34,187	$ 34,069

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
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