Financing Receivables and Allowance for Credit Losses (Detail) (USD $)	Sep. 28, 2012		Sep. 30, 2011
Financing Receivables [Line Items]
Accounts receivable with contractual maturities of more than one year, Gross amount	$ 29,900,000		$ 16,200,000
Accounts receivable with contractual maturities of more than one year, Allowance for doubtful accounts	(3,000,000)		0
Accounts receivable with contractual maturities of more than one year, Net amount	26,900,000		16,200,000
Accounts receivable with contractual maturities of more than one year, Amount past due	4,300,000		1,200,000
Note receivable from related party	0		8,800,000
Note receivable, Amount past due	0		0
Total short-term investment	49,709,000	[1]	19,205,000	[1]
Short-term investment, Amount past due	$ 0		$ 0

[1] Represents a loan to CPTC. See Note 16, "Variable Interest Entity."