Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate total of shares authorized	64,000,000	64,000,000
Shares available for future grant under stock plan, Shares	1,288,160
Shares available for issuance under plan	703,890
Stock expense related to non-vested awards not yet recognized	$ 2.9
Stock expense related to non-vested awards expected to be recognized over a weighted average period, in years	1 year 1 month 6 days
Weighted average per share fair value of stock options granted, dollar per share	$ 14.32	$ 10.25	$ 8.36
Weighted average remaining contractual term of options outstanding, in years	4 years 3 months 18 days
Aggregate intrinsic value of options outstanding	9.6
Weighted average remaining contractual term of options eligible for exercise, in years	2 years 2 months 12 days
Aggregate intrinsic value of options eligible for exercise	5.5
Total intrinsic value of stock options exercised	5.8	6.2	5.8
Vesting period of options granted, in years	3 years
Expiration period of options granted, in years	5 years
Period of payroll deductions for funding of employee purchases of company stock (in months)	6 months
Percentage of the lower of the market price at which employees can purchase company stock	85.00%
Period at which purchase price is measured at lower of market price, in months	6 months
Minimum period to hold employee purchased common stock	18 months
Number of employee stock purchased issued, Shares	16,295	19,937	18,734
Weighted average shares price, dollar per share	$ 53.01	$ 37.68	$ 33.65
2011 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in the number of shares that can be issued		1,300,000
Aggregate total of shares authorized		2,300,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock expense related to non-vested awards not yet recognized	2.9
Stock expense related to non-vested awards expected to be recognized over a weighted average period, in years	1 year 1 month 6 days
Restricted Stock Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock expense related to non-vested awards not yet recognized	$ 0.1
Restricted Stock Grants [Member] | Directors And Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options granted, in years	1 year
Restricted Stock Grants [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options granted, in years	3 years	3 years