Note 11 Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Weighted average shares used in computing per share amount:
Net income (loss)	$ 33,963	$ 36,404	$ (96,315)	$ 112,985
Weighted average common shares outstanding	68,907	75,332	70,366	74,548
Effect of dilutive stock options and restricted stock units	3,146	2,909	0	3,369
Denominator for diluted earnings per share	72,053	78,241	70,366	77,917
Net income (loss) per share:
Basic	$ 0.49	$ 0.48	$ (1.37)	$ 1.52
Diluted	$ 0.47	$ 0.47	$ (1.37)	$ 1.45
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			3,400