Weighted Average Actuarial Assumptions Used in Measuring Net Periodic Benefit Cost and Plan Obligations - Postretirement Health-Care and Life-Insurance Plans (Detail)	12 Months Ended
Jun. 28, 2014	Jun. 29, 2013	Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost Discount rate	4.80%	4.20%	5.50%
Plan obligations Discount rate	4.30%	4.80%	4.20%
Postretirement Medical And Life Insurance
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost Discount rate	4.40%	3.90%	5.30%
Plan obligations Discount rate	3.90%	4.40%	3.80%
Health-care cost trend assumed for the next year	7.00%	7.50%	7.50%
Rate to which the cost trend is assumed to decline	5.00%	5.00%	5.00%
Year that rate reaches the ultimate trend rate	2018	2018	2017

The interest rate used to adjust for the time value of money for the plan.

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- Definition

The interest rate used to adjust for the time value of money.

+ References

+ Details

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (l)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

+ Details

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- Definition

The ultimate trend rate for health care costs.

+ References

+ Details

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- Definition

Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

+ References

+ Details

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