Fair Value Of Assets And Liabilities Common Stock Subject to Repurchase Level 3 Rollforward (Details) (Level 3, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 28, 2012
Level 3
Fair Value, Temporary Equity Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, September 30, 2011	$ 158,061
Issuances of Parent Company common stock	8,098
Repurchases of Parent Company common stock	(27,293)
Change in fair market value of Parent Company common stock	28,595
Balance, September 28, 2012	$ 167,461