Financing Receivables and Allowance for Credit Losses (Detail) (USD $)	Mar. 29, 2013		Sep. 28, 2012
Financing Receivables [Line Items]
Accounts receivable with contractual maturities of more than one year, Gross amount	$ 18,300,000		$ 29,900,000
Accounts receivable with contractual maturities of more than one year, Allowance for doubtful accounts	(3,400,000)		(3,000,000)
Accounts receivable with contractual maturities of more than one year, Net amount	14,900,000		26,900,000
Accounts receivable with contractual maturities of more than one year, Amount past due	5,200,000		4,300,000
Total short-term investment	56,137,000	[1]	49,709,000	[1],[2]
Short-term investment, Amount past due

[1] Represents a loan to CPTC. See Note 15, "Variable Interest Entity."

[2] The condensed consolidated balance sheet as of September 28, 2012 was derived from audited financial statements as of that date, but does not include all disclosures required by accounting principles generally accepted in the United States of America.