Shareholders' Equity (Narrative) (Details)	12 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Oct. 02, 2010
Class of Stock [Line Items]
Number of common shares issued reflects conversion of Class B to Class A	40,549	49,158	14,044
Preferred stock, shares authorized	10,000,000
Class A Common Stock [Member]
Class of Stock [Line Items]
Common stock voting rights	one-tenth
Minimum percentage of the board of directors to be elected by class of shares	25.00%
Offering and sale of common stock	43,534,575	43,485,417
Class B Common Stock [Member]
Class of Stock [Line Items]
Common stock voting rights	one
Offering and sale of common stock	7,745,138	7,794,296