Compensation Plans (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Compensation Plans
Total stock based compensation expense recognized in the Consolidated Statements of Operations	$ 7,082	$ 6,110
Employee Stock Purchase Plan
Compensation Plans
Average expected life	6 months	6 months
Average volatility (as a percent)	55.00%	114.00%
Dividend yield (as a percent)	1.34%
Risk-free interest rate (as a percent)	0.04%	0.14%
Weighted average fair value (in dollars per share)	$ 22.57	$ 10.82
Stock options
Compensation Plans
Average expected life	5 years 6 months	6 years
Average volatility (as a percent)	75.00%	81.00%
Dividend yield (as a percent)	1.33%
Risk-free interest rate (as a percent)	1.69%	0.84%
Weighted average fair value (in dollars per share)	$ 40.98	$ 22.66
RSUs/RSAs | 2006 Plan | Minimum
Compensation Plans
Vesting period of award	3 years
RSUs/RSAs | 2006 Plan | Maximum
Compensation Plans
Vesting period of award	4 years
PSUs
Compensation Plans
Vesting period of award	3 years