Severance liabilities - Schedule of Principal Weighted Average Actuarial Assumptions Used to Determine Benefit Costs (Details)	12 Months Ended
	Jun. 30, 2023	Jun. 24, 2022	Jun. 25, 2021
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	2.10%	2.10%	2.30%
Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	0.20%	0.20%	0.40%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.90%	2.90%	3.10%