Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 29, 2012 item	Oct. 01, 2011	Oct. 02, 2010
Components in contributory retirement savings plan, (in components)	2
Employer matching pre-tax contribution, percent	50.00%
Age of employees that may participate in catch up contributions	50 years
Maximum percentage of employee contribution	6.00%
Employer matching contributions	$ 2.2	$ 2.0	$ 1.9
Employee minimum hours of service that make them eligible for retirement plan, in hours	1000 hours
Number of years as participate that employees have a vested interest equal to 100% of employer contributions, in years	3 years
Percent of employer contributions that employees have a vested interest after 3 years	100.00%
Contribution under plan	2.7	2.5	2.4
Pretax amount recognized in other comprehensive income	0.1
Portion of accumulated comprehensive income recognized as component of net periodic benefit cost over the next fiscal year	0.5
Maximum percent of investment in equity securities compared to total plan assets	40.00%
Accumulated benefit obligation of the defined benefit retirement plan	19.5	14.7
Aggregate liabilities associated with other postretirement plans	$ 3.2	$ 3.4
Minimum [Member]
Employee compensation percentage the company will contribute, subject to limitations imposed by federal law	3.00%
Maximum [Member]
Employee compensation percentage the company will contribute, subject to limitations imposed by federal law	6.00%