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RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS (Statement of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | Oct. 03, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | $ 426,947 |  | $ 346,156 | $ 284,524
Gross profit | $ 107,400 | $ 114,004 | $ 92,263 | $ 68,427 | $ 65,240 | $ 99,556 | $ 67,745 | $ 48,495 | 382,094 |  | 281,036 | 251,947
Selling, general and administrative |  |  |  |  |  |  |  |  | 133,601 |  | 134,709 | 123,323
Operating expenses |  |  |  |  |  |  |  |  | 269,011 |  | 227,083 | 213,356
Income from operations | 41,849 | 15,672 | 36,503 | 19,059 | 4,430 | 39,862 | 11,661 | (2,000) | 113,083 |  | 53,953 | 38,591
Income before income taxes |  |  |  |  |  |  |  |  | 118,515 |  | 56,164 | 39,045
Income tax expense | 2,539 | (17,657) | 5,151 | 2,573 | (5,576) | 7,619 | 6,978 | (1,312) | (7,394) |  | 7,709 | (12,867)
Net income | $ 41,225 | $ 34,808 | $ 32,670 | $ 17,396 | $ 10,761 | $ 32,925 | $ 5,109 | $ (340) | $ 126,099 |  | $ 48,455 | $ 51,912
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.58 | $ 0.49 | $ 0.46 | $ 0.25 | $ 0.15 | $ 0.47 | $ 0.07 | $ 0.00 | $ 1.78 | [1] | $ 0.69 | $ 0.69
Diluted (in dollars per share) | $ 0.57 | $ 0.48 | $ 0.45 | $ 0.24 | $ 0.15 | $ 0.46 | $ 0.07 | $ 0.00 | $ 1.75 | [1] | $ 0.68 | $ 0.69
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | $ 433,995 |  | $ 340,463 | $ 277,379
Gross profit | $ 104,739 | $ 111,698 | $ 90,291 | $ 68,318 | $ 66,621 | $ 100,040 | $ 69,647 | $ 50,421 | 375,046 |  | 286,729 | 259,092
Selling, general and administrative |  |  |  |  |  |  |  |  | 141,382 |  | 141,816 | 131,808
Operating expenses |  |  |  |  |  |  |  |  | 276,792 |  | 234,190 | 221,841
Income from operations | 36,904 | 11,464 | 32,605 | 17,281 | 3,913 | 38,622 | 11,709 | (1,705) | 98,254 |  | 52,539 | 37,251
Income before income taxes |  |  |  |  |  |  |  |  | 103,686 |  | 54,750 | 37,705
Income tax expense | 2,242 | (17,867) | 4,882 | 2,608 | (5,661) | 7,519 | 7,045 | (1,265) | (8,135) |  | 7,638 | (12,934)
Net income | $ 36,576 | $ 30,811 | $ 29,041 | $ 15,583 | $ 10,329 | $ 31,785 | $ 5,089 | $ (91) | $ 112,011 |  | $ 47,112 | $ 50,639
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.52 | $ 0.43 | $ 0.41 | $ 0.22 | $ 0.15 | $ 0.45 | $ 0.07 | $ 0.00 | $ 1.58 |  | $ 0.67 | $ 0.67
Diluted (in dollars per share) | $ 0.51 | $ 0.43 | $ 0.40 | $ 0.22 | $ 0.15 | $ 0.45 | $ 0.07 | $ 0.00 | $ 1.55 |  | $ 0.67 | $ 0.67
Effect of Restatement |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | $ (7,048) |  | $ 5,693 | $ 7,145
Gross profit | $ 2,661 | $ 2,306 | $ 1,972 | $ 109 | $ (1,381) | $ (484) | $ (1,902) | $ (1,926) | 7,048 |  | (5,693) | (7,145)
Selling, general and administrative |  |  |  |  |  |  |  |  | (7,781) |  | (7,107) | (8,485)
Operating expenses |  |  |  |  |  |  |  |  | (7,781) |  | (7,107) | (8,485)
Income from operations | 4,945 | 4,208 | 3,898 | 1,778 | 517 | 1,240 | (48) | (295) | 14,829 |  | 1,414 | 1,340
Income before income taxes |  |  |  |  |  |  |  |  | 14,829 |  | 1,414 | 1,340
Income tax expense | 297 | 210 | 269 | (35) | 85 | 100 | (67) | (47) | 741 |  | 71 | 67
Net income | $ 4,649 | $ 3,997 | $ 3,629 | $ 1,813 | $ 432 | $ 1,140 | $ 20 | $ (249) | $ 14,088 |  | $ 1,343 | $ 1,273
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.06 | $ 0.06 | $ 0.05 | $ 0.03 | $ 0.01 | $ 0.02 | $ 0.00 | $ 0.00 | $ 0.20 |  | $ 0.02 | $ 0.02
Diluted (in dollars per share) | $ 0.06 | $ 0.06 | $ 0.05 | $ 0.03 | $ 0.01 | $ 0.02 | $ 0.00 | $ 0.00 | $ 0.20 |  | $ 0.02 | $ 0.02
[1] | EPS for the year may not equal the sum of quarterly EPS due to changes in weighted share calculations.

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