Employee Compensation Plans (Details 3) (USD $)	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Employee Stock [Member]
Compensation Plans
Average expected life	6 months	6 months	6 months
Average volatility (as a percent)	55.00%	86.00%	70.00%
Dividend yield (as a percent)	1.14%
Risk-free interest rate (as a percent)	0.06%	13.00%	9.00%
Weighted average fair value (in dollars per share)	$ 26.06	$ 14.38	$ 11.61
Employee Stock Option [Member]
Compensation Plans
Average expected life	5 years 6 months	6 years	6 years
Average volatility (as a percent)	74.00%	81.00%	69.00%
Dividend yield (as a percent)	1.30%
Risk-free interest rate (as a percent)	1.70%	1.02%	1.31%
Weighted average fair value (in dollars per share)	$ 42.38	$ 31.23	$ 30.10