Financing Receivables And Allowance For Credit Losses (Details) (USD $)	12 Months Ended
	Sep. 30, 2011	Oct. 01, 2010
Financing Receivables And Allowance For Credit Losses [Abstract]
Gross amount of accounts receivable with contractual maturities of more than one year	$ 16,200,000
Allowance for doubtful accounts for accounts receivable with contractual maturities of more than one year	0
Net amount of accounts receivable with contractual maturities of more than one year	16,200,000
Amount past due	1,200,000
Note receivable from related party	8,800,000
Total note receivable	8,800,000
Amount past due	0
Short-term investment	19,205,000	0
Amount past due	0
Accounts receivable with contractual maturities of more than one year, amount sold	$ 3,600,000