Plan Assets Investment Policy Ranges for Major Asset Classes (Detail)	12 Months Ended
Oct. 01, 2011
Equity investments
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, equity, Minimum	36.00%
Asset allocation ranges, equity, Maximum	60.00%
Equity investments \| Small cap
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, equity, Minimum	0.00%
Asset allocation ranges, equity, Maximum	10.00%
Equity investments \| US Mid / Large cap
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, equity, Minimum	15.00%
Asset allocation ranges, equity, Maximum	30.00%
Equity investments \| International/Global Equities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, equity, Minimum	7.00%
Asset allocation ranges, equity, Maximum	27.00%
Fixed Income
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, debt, Minimum	20.00%
Asset allocation ranges, debt, Maximum	40.00%
Alternative Investments
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, Minimum	15.00%
Asset allocation ranges, Maximum	30.00%
Alternative Investments \| Diversified
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, Minimum	0.00%
Asset allocation ranges, Maximum	10.00%
Alternative Investments \| Distressed
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, Minimum	0.00%
Asset allocation ranges, Maximum	10.00%
Alternative Investments \| Private Equity/Venture capital
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, Minimum	0.00%
Asset allocation ranges, Maximum	12.00%
Alternative Investments \| Real estate
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, real estate, Minimum	0.00%
Asset allocation ranges, real estate, Maximum	15.00%
Cash
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Asset allocation ranges, Minimum	0.00%
Asset allocation ranges, Maximum	5.00%

Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]

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Target allocation maximum percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation minimum percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(2)

-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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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Target allocation maximum percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation minimum percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation maximum percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation maximum percentage of investments in real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation minimum percentage of investments in real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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