Pension and retirement plan (Textuals) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Apr. 02, 2016	Apr. 02, 2016
Pension and retirement plan
Defined benefit plans, estimated future employer contributions each remaining quarter of current fiscal year	$ 10.0
Current year-to-date contributions		$ 30.0

The increase in the fair value of plan assets from contributions made by the employer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration