Note 12 Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Earnings Per Share [Line Items]
Net income (loss)	$ 141,515	$ (95,533)	$ 138,833
Weighted average shares used in computing per share amount:
Weighted average common shares outstanding	69,129	69,833	74,481
Effect of dilutive stock options and restricted stock units	2,549	0	3,647
Denominator for diluted earnings per share	71,678	69,833	78,128
Net income (loss) per share:
Basic	$ 2.05	$ (1.37)	$ 1.86
Diluted	$ 1.97	$ (1.37)	$ 1.78