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Note 9 - Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Sep. 28, 2013
Minimum [Member]      
Outstanding (in dollars per share) $ 6.89 $ 5.43 $ 0.36
Granted (in dollars per share) 18.05 19.08 16.45
Exercised (in dollars per share) 6.89 5.43 0.36
Outstanding (in dollars per share) 7.55 6.89 5.43
Forfeited (in dollars per share) $ 9.16    
Exercisable (in dollars per share)    
Maximum [Member]      
Outstanding (in dollars per share) $ 20.50 20.27 20.27
Granted (in dollars per share) 21.96 20.50 17.22
Exercised (in dollars per share) 11.15 20.27 12.43
Outstanding (in dollars per share) 21.96 20.50 20.27
Forfeited (in dollars per share) $ 21.96    
Exercisable (in dollars per share)    
Weighted Average [Member]      
Outstanding (in dollars per share) $ 14.23 12.65 11.09
Granted (in dollars per share) 19.89 19.80 16.84
Exercised (in dollars per share) 9.17 10.42 9.27
Outstanding (in dollars per share) 15.14 $ 14.23 $ 12.65
Forfeited (in dollars per share) 15.37    
Vested and anticipated to vest (in dollars per share) 15.11    
Exercisable (in dollars per share) $ 13.52    
Outstanding (in shares) 871 918 1,160
Outstanding    
Granted (in shares) 134 136 131
Exercised (in shares) (27) (183) (373)
Exercised $ 328 $ 1,789 $ 2,744
Outstanding (in shares) 923 871 918
Granted (in shares) 134 136 131
Exercised (in shares) (27) (183) (373)
Forfeited (in shares) (55)    
Outstanding 6 years 21 days    
Outstanding $ 2,188    
Vested and anticipated to vest (in shares) 918    
Vested and anticipated to vest 6 years 14 days    
Vested and anticipated to vest $ 2,188    
Exercisable (in shares) 667    
Exercisable at October 3, 2015 4 years 343 days    
Exercisable $ 2,188