Stock-Based Compensation (Narrative) (Details) (USD $)		6 Months Ended		1 Months Ended
	Mar. 30, 2012	Mar. 30, 2012 Stock Options [Member] Y	Mar. 30, 2012 Restricted Stock Units [Member] Y	Jan. 30, 2005 Employee Stock Purchase Plan [Member]	Jan. 30, 2005 Class A Common Stock [Member] Employee Stock Purchase Plan [Member]
Stock options expected to vest		$ 61,500,000	$ 57,900,000
Employee stock options expected to be recognized over a weighted-average period, years		2.79	3.08
Period end stock price	$ 38.06
Percent of eligible compensation allowed to be withheld				10.00%
Maximum amount of common stock available for eligible employees					$ 25,000
Maximum number of common stock available for eligible employees, shares					1,000
Percentage of Discount of closing price				15.00%