Note 10 Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012
Earnings Per Share [Line Items]
Net income (loss)	$ 21,191	$ (1,439)	$ 21,812	$ 7,136
Potentially Dilutive Securities	7,620	13,589	8,534	7,943
Weighted average shares used in computing per share amount:
Basic	82,543	81,225	82,226	81,059
Diluted	84,683	81,225	84,369	83,511
Net income (loss)per share:
Basic	$ 0.26	$ (0.02)	$ 0.27	$ 0.09
Diluted	$ 0.25	$ (0.02)	$ 0.26	$ 0.09
Employee stock options
Earnings Per Share [Line Items]
Potentially Dilutive Securities	7,614	11,391	8,529	7,583
Restricted stock units
Earnings Per Share [Line Items]
Potentially Dilutive Securities	6	2,198	5	360