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Note P - Quarterly Financial Date (Unaudited) (Detail) - Quarterly Financial Information (USD $)
 12 Months Ended
Sep. 29, 2012
Sep. 24, 2011
Sep. 25, 2010
Net sales $ 830,796,000 $ 744,071,000 $ 696,703,000
Gross profit 250,185,000 229,774,000 227,780,000
Net earnings 54,118,000 55,063,000 48,409,000
Net earnings per diluted share (in Dollars per share) $ 2.86 [1] $ 2.93 [1] $ 2.59
1st Quarter [Member]
      
Net sales 172,686,000 155,632,000  
Gross profit 46,406,000 46,101,000  
Net earnings 5,485,000 7,094,000  
Net earnings per diluted share (in Dollars per share) $ 0.29 [1] $ 0.38 [1]  
2nd Quarter [Member]
      
Net sales 189,554,000 162,731,000  
Gross profit 53,987,000 49,022,000  
Net earnings 10,423,000 8,659,000  
Net earnings per diluted share (in Dollars per share) $ 0.55 [1] $ 0.46 [1]  
3rd Quarter [Member]
      
Net sales 226,335,000 206,328,000  
Gross profit 72,507,000 67,541,000  
Net earnings 18,672,000 23,326,000  
Net earnings per diluted share (in Dollars per share) $ 0.99 [1] $ 1.24 [1]  
4th Quarter [Member]
      
Net sales 242,221,000 219,380,000  
Gross profit 77,285,000 67,110,000  
Net earnings $ 19,538,000 $ 15,984,000  
Net earnings per diluted share (in Dollars per share) $ 1.03 [1] $ 0.85 [1]  
[1] Total of quarterly amounts do not necessarily agree to the annual report amounts due to separate quarterly calculations of weighted average shares outstanding.