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SEGMENT INFORMATION (Operating information by segment) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2016 | Jan. 02, 2016
Net revenue: |  |
Net revenue | $ 149,639 | $ 108,534
Cost of sales : |  |
Cost of sales | 81,321 | 58,113
Gross profit : |  |
Gross profit | 68,318 | 50,421
Operating expenses: |  |
Operating expenses | 51,037 | 52,126
Income from operations: |  |
Income from operations | 17,281 | (1,705)
Equipment [Member] |  |
Net revenue: |  |
Net revenue | 132,979 | 92,974
Income from operations: |  |
Income from operations | 12,674 | (6,426)
Expendable Tools [Member] |  |
Net revenue: |  |
Net revenue | 16,660 | 15,560
Income from operations: |  |
Income from operations | $ 4,607 | $ 4,721

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