Note 9 - Stock-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Options outstanding, balance (in shares)	388	264	392
Weighted average exercise price per share (in dollars per share)	$ 26.16	$ 29.25	$ 23.40
Options outstanding, granted (in shares)	121	129	77
Weighted average exercise price per share, granted (in dollars per share)	$ 21.08	$ 19.74	$ 34.84
Options outstanding, exercised (in shares)		(5)	(196)
Weighted average exercise price per share, exercised (in dollars per share)		$ 23.95	$ 19.68
Aggregate intrinsic value, exercised		$ 21	$ 3,866
Options outstanding, forfeited (in shares)	(27)		(9)
Weighted average exercise price per share, forfeited (in dollars per share)	$ 25.88		$ 29.88
Options outstanding, balance (in shares)	482	388	264	392
Weighted average exercise price per share (in dollars per share)	$ 24.90	$ 26.16	$ 29.25	$ 23.40
Contractual term - weighted average, balance (Year)	6 years 6 months
Aggregate intrinsic value, outstanding	$ 160
Options outstanding, vested and anticipated to vest in future (in shares)	477
Weighted average exercise price per share, vested and anticipated to vest in future (in dollars per share)	$ 24.95
Contractual term - weighted average, vested and anticipated to vest in future (Year)	6 years 5 months 19 days
Aggregate intrinsic value, vested and anticipated to vest in future	$ 159
Options outstanding, exercisable (in shares)	283
Weighted average exercise price per share, exercisable (in dollars per share)	$ 26.99
Contractual term - weighted average, exercisable (Year)	4 years 8 months 8 days
Aggregate intrinsic value, exercisable	$ 133
Minimum [Member]
Exercise price per share, balance, lower (in dollars per share)	$ 10.23	10.23	10.23	9.16
Exercise price per share, granted, lower (in dollars per share)	19.86	18.25	29.69
Exercise price per share, exercised, lower (in dollars per share)		18.05	9.16
Exercise price per share, forfeited, lower (in dollars per share)	18.05		23.95
Maximum [Member]
Exercise price per share, balance, upper (in dollars per share)	41.85	41.85	41.85	$ 37.06
Exercise price per share, granted, upper (in dollars per share)	22.09	21.57	41.85
Exercise price per share, exercised, upper (in dollars per share)		$ 26.75	37.06
Exercise price per share, forfeited, upper (in dollars per share)	$ 41.85		$ 37.06