Note 12 Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Weighted average shares used in computing per share amount:
Net income (loss)	$ 40,885	$ 24,632	$ 78,837	$ (130,278)
Weighted average common shares outstanding	68,821	70,441	68,556	71,096
Effect of dilutive stock options and restricted stock units	2,625	3,141	2,606	0
Denominator for diluted earnings per share	71,446	73,582	71,162	71,096
Net income (loss) per share:
Basic	$ 0.59	$ 0.35	$ 1.15	$ (1.83)
Diluted	$ 0.57	$ 0.33	$ 1.11	$ (1.83)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				4,000