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SEGMENT INFORMATION (Operating information by segment) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 03, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Oct. 03, 2015	Sep. 27, 2014	Sep. 28, 2013
Net revenue:
Net revenue	$ 119,172	$ 164,634	$ 145,227	$ 107,438	$ 194,733	$ 180,517	$ 114,206	$ 79,113	$ 536,471	$ 568,569	$ 534,938
Cost of sales :
Cost of sales									277,379	295,015	287,993
Gross profit :
Gross profit	58,217	77,571	68,570	54,734	92,360	85,157	57,672	38,365	259,092	273,554	246,945
Operating expenses:
Operating expenses									221,841	196,570	181,139
Income from operations:
Income from operations	$ 1,648	$ 16,086	$ 9,791	$ 9,726	$ 37,497	$ 31,584	$ 10,111	$ (2,208)	37,251	76,984	65,806
Equipment [Member]
Net revenue:
Net revenue									472,002	503,049	472,567
Income from operations:
Income from operations									21,618	59,769	52,991
Expendable Tools [Member]
Net revenue:
Net revenue									64,469	65,520	62,371
Income from operations:
Income from operations									$ 15,633	$ 17,215	$ 12,815

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- 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.

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