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QUARTERLY FINANCIAL SUMMARY (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 30, 2016 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Jan. 01, 2016 | Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
Net sales | $ 91,755 | $ 155,274 | $ 149,807 | $ 93,729 | $ 74,937 | $ 139,300 | $ 134,192 | $ 85,298 | $ 490,565 | $ 433,727 | $ 430,489
Gross profit | 38,832 | 70,630 | 64,913 | 36,565 | 28,885 | 59,283 | 54,995 | 33,299 | 210,940 | 176,462 | 171,733
Operating profit (loss) | (76) | 24,737 | 20,458 | 472 | (4,927) | 13,583 | 15,138 | (900) | 45,591 | 22,894 | 17,853
Income (loss) before income taxes | 858 | 25,560 | 21,837 | (45) | (4,360) | 13,865 | 14,669 | (519) | 48,210 | 23,655 | 15,753
Income tax expense (benefit) | 269 | 9,007 | 7,878 | (4,101) | (2,233) | 7,024 | 5,348 | 15 | 13,053 | 10,154 | 5,137
Net income | $ 589 | $ 16,553 | $ 13,959 | $ 4,056 | $ (2,127) | $ 6,841 | $ 9,321 | $ (534) | $ 35,157 | $ 13,501 | $ 10,616
Class A |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share - Basic (USD per share) | $ 0.06 | $ 1.68 | $ 1.41 | $ 0.41 | $ (0.21) | $ 0.69 | $ 0.94 | $ (0.05) | $ 3.56 | $ 1.36 | $ 1.08
Net income per common share - Diluted (USD per share) | 0.06 | 1.65 | 1.39 | 0.40 | (0.21) | 0.68 | 0.93 | (0.05) | 3.51 | 1.34 | 1.06
Class B |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share - Basic (USD per share) | 0.05 | 1.52 | 1.28 | 0.37 | (0.21) | 0.63 | 0.86 | (0.05) | 3.23 | 1.24 | 0.98
Net income per common share - Diluted (USD per share) | $ 0.06 | $ 1.65 | $ 1.39 | $ 0.40 | $ (0.21) | $ 0.68 | $ 0.93 | $ (0.05) | $ 3.51 | $ 1.34 | $ 1.06

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