Equity-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Sep. 29, 2012
Outside Directors Member
Equity Based Compensation [Line Items]
Stock option vesting period	1 year
Key Employees Member
Equity Based Compensation [Line Items]
Stock option vesting period	5 years
Officers And Key Employees Member
Equity Based Compensation [Line Items]
Stock option vesting period	3 years
1998 Stock Option Plan [Member]
Equity Based Compensation [Line Items]
Shares authorized for the issuance	2,025,000
2003 Stock Option Plan [Member]
Equity Based Compensation [Line Items]
Shares authorized for the issuance	1,350,000
2008 Stock Appreciation Rights Plan [Member]
Equity Based Compensation [Line Items]
Shares authorized for the issuance	2,000,000
Stock option term in years, max	10
Stock Options [Member]
Equity Based Compensation [Line Items]
Stock option term in years, max	10
Unvested compensation expense	925
Unvested compensation expense weighted-average period of recognition, in years	3 years
Stock Appreciation Rights (SARs) [Member]
Equity Based Compensation [Line Items]
Unvested compensation expense	3,509
Unvested compensation expense weighted-average period of recognition, in years	2 years
Class A Common Stock [Member]
Equity Based Compensation [Line Items]
Closing price of common stock	37.87