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Fair value measurements (Details) - USD ($)
$ in Thousands
Sep. 28, 2025
Jun. 29, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities held in a “rabbi trust” $ 41,321 $ 38,370
Fair Value Measurements Assets (Liabilities) 41,321 38,370
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities held in a “rabbi trust” 41,321 38,370
Fair Value Measurements Assets (Liabilities) 41,321 38,370
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities held in a “rabbi trust” 0 0
Fair Value Measurements Assets (Liabilities) 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities held in a “rabbi trust” 0 0
Fair Value Measurements Assets (Liabilities) $ 0 $ 0