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Derivative financial instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 27, 2020 | Jun. 29, 2019 | Jun. 30, 2018
Derivative financial instruments |  |  |
Net derivative financial instrument (loss) gain | $ 12,739 | $ 84 | $ 2,735

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration