Note 6 - Stock-Based Compensation - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Apr. 02, 2016 USD ($) $ / shares shares
Minimum [Member]
Outstanding, beginning balance (in dollars per share)	$ 7.55
Granted (in dollars per share)	23.95
Exercised (in dollars per share)	7.55
Outstanding, ending balance (in dollars per share)	7.55
Maximum [Member]
Outstanding, beginning balance (in dollars per share)	21.96
Granted (in dollars per share)	23.95
Exercised (in dollars per share)	20.50
Outstanding, ending balance (in dollars per share)	23.95
Weighted Average [Member]
Outstanding, beginning balance (in dollars per share)	15.14
Granted (in dollars per share)	23.95
Exercised (in dollars per share)	11.96
Outstanding, ending balance (in dollars per share)	17.63
Vested and anticipated to vest (in dollars per share)	17.60
Exercisable (in dollars per share)	$ 15.79
Outstanding, beginning balance (in shares) | shares	923
Granted (in shares) | shares	56
Exercised (in shares) | shares	(343)
Exercised | $	$ 4,404
Outstanding, ending balance (in shares) | shares	636
Outstanding, ending balance	6 years 324 days
Outstanding, ending balance | $	$ 7,230
Vested and anticipated to vest (in shares) | shares	630
Vested and anticipated to vest	6 years 317 days
Vested and anticipated to vest | $	$ 7,173
Exercisable (in shares) | shares	384
Exercisable	5 years 200 days
Exercisable | $	$ 5,068