Changes in accumulated other comprehensive income (Details) - USD ($) $ in Thousands	6 Months Ended		9 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Sep. 27, 2025	Sep. 28, 2024
Accumulated Other Comprehensive Income [Roll Forward]
Beginning of Period	$ (269,390)		$ (269,390)
Other comprehensive income before reclassification			131,784	$ 34,816
Amounts reclassified from accumulated other comprehensive income			(11,699)	(19,774)
Net current-period other comprehensive income			120,085	15,042
End of Period			(149,305)
Accumulated Other Comprehensive (income) Loss, Defined Benefit Plan, Tax			14,200	4,800
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax			4,400	6,200
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax			400	800
Unrealized gain on interest rate swap, tax			(3,614)	(4,976)
Other Comprehensive Income, Other, Net of Tax	(269,390)	$ (223,198)	(149,305)	(208,156)
Interest Rate Swap
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income before reclassification			1,521	9,135
Amounts reclassified from accumulated other comprehensive income			(13,287)	(21,309)
Net current-period other comprehensive income			(11,766)	(12,174)
Other Comprehensive Income, Other, Net of Tax	22,399	32,005	10,633	19,831
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income before reclassification			135,229	31,352
Amounts reclassified from accumulated other comprehensive income			0	0
Net current-period other comprehensive income			135,229	31,352
Other Comprehensive Income, Other, Net of Tax	(213,255)	(145,490)	(78,026)	(114,138)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income before reclassification			(4,966)	(5,671)
Amounts reclassified from accumulated other comprehensive income			1,588	1,535
Net current-period other comprehensive income			(3,378)	(4,136)
Other Comprehensive Income, Other, Net of Tax	$ (78,534)	$ (109,713)	$ (81,912)	$ (113,849)