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Note 8 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Options outstanding, beginning balance (in shares) 371 923 871
Exercise price per share, beginning balance (in dollars per share) $ 20.81 $ 15.14 $ 14.23
Options outstanding, granted (in shares) 88 99 134
Exercise price per share, granted (in dollars per share) $ 30.93 $ 28.47 $ 19.89
Options outstanding, exercised (in shares) (67) (651) (27)
Exercise price per share, exercised (in dollars per share) $ 19.05 $ 13.93 $ 9.17
Aggregate intrinsic value, exercised $ 1,212 $ 8,718 $ 328
Options outstanding, forfeited (in shares)     (55)
Exercise price per share, forfeited (in dollars per share)     $ 15.37
Options outstanding, ending balance (in shares) 392 371 923
Exercise price per share, ending balance (in dollars per share) $ 23.40 $ 20.81 $ 15.14
Contractual term - weighted average (Year) 7 years 233 days    
Aggregate intrinsic value $ 1,845    
Options outstanding, vested and anticipated to vest in future (in shares) 388    
Weighted average exercise price per share, vested and anticipated to vest in future (in dollars per share) $ 23.36    
Contractual term - weighted average, vested and anticipated to vest in future (Year) 7 years 229 days    
Aggregate intrinsic value, vested and anticipated to vest in future $ 1,837    
Options outstanding, exercisable (in shares) 194    
Weighted average exercise price per share, exercisable (in dollars per share) $ 19.05    
Contractual term - weighted average, exercisable (Year) 6 years 149 days    
Aggregate intrinsic value, exercisable $ 1,491    
Minimum [Member]      
Exercise price per share, beginning balance (in dollars per share) $ 9.16 7.55 6.89
Exercise price per share, granted (in dollars per share) 26.75 23.95 18.05
Exercise price per share, exercised (in dollars per share) 9.16 7.55 6.89
Exercise price per share, forfeited (in dollars per share)     9.16
Exercise price per share, ending balance (in dollars per share) 9.16 9.16 7.55
Maximum [Member]      
Exercise price per share, beginning balance (in dollars per share) 34.49 21.96 20.50
Exercise price per share, granted (in dollars per share) 37.06 34.49 21.96
Exercise price per share, exercised (in dollars per share) 23.95 21.96 11.15
Exercise price per share, forfeited (in dollars per share)     21.96
Exercise price per share, ending balance (in dollars per share) $ 37.06 $ 34.49 $ 21.96