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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands | 12 Months Ended
--- | ---
Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
Net sales | $ 490,565,000 | $ 433,727,000 | $ 430,489,000
Cost of sales | 279,625,000 | 257,265,000 | 258,756,000
Gross profit | 210,940,000 | 176,462,000 | 171,733,000
Operating expenses: |  |  |
Marketing and selling | 100,359,000 | 90,690,000 | 93,707,000
Administrative management, finance and information systems | 45,824,000 | 38,251,000 | 43,690,000
Goodwill and other intangible assets impairment | 0 | 6,197,000 | 0
Research and development | 19,166,000 | 18,430,000 | 16,483,000
Total operating expenses | 165,349,000 | 153,568,000 | 153,880,000
Operating profit | 45,591,000 | 22,894,000 | 17,853,000
Interest income | (316,000) | (81,000) | (64,000)
Interest expense | 757,000 | 727,000 | 865,000
Other (income) expense | (3,060,000) | (1,407,000) | 1,299,000
Profit before income taxes | 48,210,000 | 23,655,000 | 15,753,000
Income tax expense | 13,053,000 | 10,154,000 | 5,137,000
Net income | $ 35,157,000 | $ 13,501,000 | $ 10,616,000
Weighted average common shares - Basic: |  |  |
Dilutive stock options and restricted stock units (shares) | 33 | 16 | 0
Weighted average common shares - Dilutive (shares) | 9,920 | 9,855 | 9,727
Class A |  |  |
Weighted average common shares - Basic: |  |  |
Weighted average common shares - Basic (shares) | 8,675 | 8,627 | 8,515
Net income per common share - Basic: |  |  |
Net income per common share - Basic (USD per share) | $ 3.56 | $ 1.36 | $ 1.08
Net income per common share - Diluted: |  |  |
Net income per common share - Diluted (USD per share) | 3.51 | 1.34 | 1.06
Dividends declared per common share: |  |  |
Dividends declared per common share (USD per share) | $ 0.37 | $ 0.32 | $ 0.31
Class B |  |  |
Weighted average common shares - Basic: |  |  |
Weighted average common shares - Basic (shares) | 1,212 | 1,212 | 1,212
Net income per common share - Basic: |  |  |
Net income per common share - Basic (USD per share) | $ 3.23 | $ 1.24 | $ 0.98
Net income per common share - Diluted: |  |  |
Net income per common share - Diluted (USD per share) | 3.51 | 1.34 | 1.06
Dividends declared per common share: |  |  |
Dividends declared per common share (USD per share) | $ 0.34 | $ 0.29 | $ 0.28

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