Severance liabilities - Schedule of Severance Liabilities Recognized in Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 24, 2022	Jun. 25, 2021
Retirement Benefits [Abstract]
Non-current assets	$ 134	$ 59
Non-current liabilities	$ 18,384	$ 19,485

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant