Long-term Debt Outstanding (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 28, 2012 Installment
Debt Instrument [Line Items]
Unsecured term loan, number of installment payments	2
Unsecured term loan, 6.70% due in one installment of $6.25 payable in fiscal year 2014
Debt Instrument [Line Items]
Fixed interest rate	6.70%
Unsecured term loan, payable amount	6.25
Unsecured term loan, number of installment payments	1
Debt instrument maturity date	2014
Loan assumed through purchase of land and building, 7.34% was fully paid in fiscal year 2012
Debt Instrument [Line Items]
Fixed interest rate	7.34%
Debt instrument maturity date	2012

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant