Note 9 Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Earnings Per Share [Line Items]
Net income	$ 138,833	$ 187,838	$ 377,261
Potentially dilutive securities	6	480	789
Weighted average shares used in computing per share amount:
Weighted average common shares outstanding	74,481	75,094	81,818
Effect of dilutive stock options and restricted stock units	3,647	3,693	3,823
Denominator for diluted earnings per share	78,128	78,787	85,641
Net income per share:
Basic	$ 1.86	$ 2.50	$ 4.61
Diluted	$ 1.78	$ 2.38	$ 4.41
Employee stock options
Earnings Per Share [Line Items]
Potentially dilutive securities	0	477	776
Restricted stock units
Earnings Per Share [Line Items]
Potentially dilutive securities	6	3	13