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Condensed Consolidated Statements Of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Mar. 31, 2017
Apr. 01, 2016
Net sales $ 149,807 $ 134,192 $ 243,536 $ 219,490
Cost of sales 84,894 79,197 142,058 131,196
Gross profit 64,913 54,995 101,478 88,294
Operating expenses:        
Marketing and selling 28,796 25,776 49,618 45,775
Administrative management, finance and information systems 11,001 9,891 21,562 20,045
Research and development 4,658 4,190 9,368 8,236
Total operating expenses 44,455 39,857 80,548 74,056
Operating profit 20,458 15,138 20,930 14,238
Interest income (9) (10) (32) (18)
Interest expense 124 297 610 487
Other (income) expense, net (1,494) 182 (1,440) (381)
Profit before income taxes 21,837 14,669 21,792 14,150
Income tax expense 7,878 5,348 3,777 5,363
Net income $ 13,959 $ 9,321 $ 18,015 $ 8,787
Weighted average common shares - Basic:        
Participating securities 19   21  
Weighted average common shares - Dilutive 9,915 9,848 9,892 9,821
Class A [Member]        
Weighted average common shares - Basic:        
Weighted average common shares - Basic 8,684 8,636 8,659 8,609
Net income per common share - Basic:        
Net income per common share - Basic $ 1.41 $ 0.94 $ 1.83 $ 0.89
Net income per common share - Diluted:        
Net income per common share - Diluted 1.39 0.93 1.80 0.88
Dividends declared per common share:        
Dividends Per Common Share $ 0.09 $ 0.08 $ 0.18 $ 0.16
Class B [Member]        
Weighted average common shares - Basic:        
Weighted average common shares - Basic 1,212 1,212 1,212 1,212
Net income per common share - Basic:        
Net income per common share - Basic $ 1.28 $ 0.86 $ 1.66 $ 0.81
Net income per common share - Diluted:        
Net income per common share - Diluted 1.39 0.93 1.80 0.88
Dividends declared per common share:        
Dividends Per Common Share $ 0.08 $ 0.07 $ 0.16 $ 0.15