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SEGMENT INFORMATION (Operating information by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Apr. 01, 2017	Apr. 02, 2016
Net revenue:
Net revenue	$ 199,613	$ 156,400	$ 349,252	$ 264,934
Cost of sales :
Cost of sales	109,322	86,753	190,643	144,866
Gross profit :
Gross profit	90,291	69,647	158,609	120,068
Operating expenses:
Operating expenses	57,686	57,938	108,723	110,064
Income from operations:
Income from operations	32,605	11,709	49,886	10,004
Equipment [Member]
Net revenue:
Net revenue	180,979	141,062	313,958	234,036
Income from operations:
Income from operations	28,069	7,716	40,743	1,290
Expendable Tools [Member]
Net revenue:
Net revenue	18,634	15,338	35,294	30,898
Income from operations:
Income from operations	$ 4,536	$ 3,993	$ 9,143	$ 8,714

X

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
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-Topic 225
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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-Name Accounting Standards Codification
-Topic 225
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