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SEGMENT INFORMATION (Operating information by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 02, 2016	Mar. 28, 2015	Apr. 02, 2016	Mar. 28, 2015
Net revenue:
Net revenue	$ 156,400	$ 145,227	$ 264,934	$ 252,665
Cost of sales :
Cost of sales	86,753	76,657	144,866	129,361
Gross profit :
Gross profit	69,647	68,570	120,068	123,304
Operating expenses:
Operating expenses	57,938	58,779	110,064	103,787
Income from operations:
Income from operations	11,709	9,791	10,004	19,517
Equipment [Member]
Net revenue:
Net revenue	141,062	129,816	234,036	220,772
Income from operations:
Income from operations	7,716	6,307	1,290	11,753
Expendable Tools [Member]
Net revenue:
Net revenue	15,338	15,411	30,898	31,893
Income from operations:
Income from operations	$ 3,993	$ 3,484	$ 8,714	$ 7,764

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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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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