Note 10 Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Apr. 01, 2017	Apr. 02, 2016	Apr. 01, 2017	Apr. 02, 2016
Earnings Per Share [Line Items]
Net income	$ 31,717	$ 30,361	$ 76,581	$ 57,499
Weighted average shares used in computing per share amount:
Weighted average common shares outstanding	74,761	75,477	74,156	76,605
Effect of dilutive stock options and restricted stock units	3,103	3,048	3,375	3,135
Denominator for diluted earnings per share	77,864	78,525	77,531	79,740
Net income per share:
Basic	$ 0.42	$ 0.40	$ 1.03	$ 0.75
Diluted	$ 0.41	$ 0.39	$ 0.99	$ 0.72
Potentially dilutive securities [Abstract]
Potentially dilutive securities	4	1,595	4	1,554
Employee stock options
Potentially dilutive securities [Abstract]
Potentially dilutive securities	0	1,531	0	1,550
Restricted stock units
Potentially dilutive securities [Abstract]
Potentially dilutive securities	4	64	4	4

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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