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SEGMENT INFORMATION (Operating information by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Net revenue:
Net revenue	$ 243,897	$ 216,414	$ 593,149	$ 481,348
Cost of sales :
Cost of sales	132,199	116,374	322,842	261,240
Gross profit :
Gross profit	111,698	100,040	270,307	220,108
Operating expenses:
Operating expenses	100,234	61,418	208,957	171,482
Income from operations:
Income from operations	11,464	38,622	61,350	48,626
Impairment charges	35,207	0	35,207	0
Electronics Assembly/ Hybrid [Member]
Income from operations:
Impairment charges	35,200		35,207
Expendable Tools [Member]
Net revenue:
Net revenue	21,440	16,286	56,734	47,184
Income from operations:
Income from operations	5,207	3,946	14,350	12,660
Equipment [Member]
Net revenue:
Net revenue	222,457	200,128	536,415	434,164
Income from operations:
Income from operations	$ 6,257	$ 34,676	$ 47,000	$ 35,966

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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