Pension and retirement plans (Plan Asset Allocations) (Details)	Jun. 28, 2014	Jun. 29, 2013
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	75.00%	75.00%
Fixed income debt securities
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	24.00%	24.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	1.00%	1.00%

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

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

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