Financing Receivables and Allowance for Credit Losses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 28, 2012	Sep. 30, 2011
Financing Receivables [Line Items]
Accounts receivable with contractual maturities of more than one year, amount sold	$ 11.0	$ 3.6

The amount of any significant sales of financing receivables during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

Name:	us-gaap_FinancingReceivableSignificantSales
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration