Accumulated Other Comprehensive Income (Loss) (Changes in AOCI by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2026	Mar. 29, 2025	Mar. 28, 2026	Mar. 29, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			$ 1,992,555
Other comprehensive income (loss), net of tax	$ (9,551)	$ 25,123	(3,628)	$ (14,060)
End of period	2,102,480	1,806,040	2,102,480	1,806,040
Accumulated foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			(74,614)
OCI before reclassifications			(6,362)
Amounts reclassified from AOCIL			0
Other comprehensive income (loss), net of tax			(6,362)
End of period	(80,976)		(80,976)
Accumulated retirement liability
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			(83,312)
OCI before reclassifications			29
Amounts reclassified from AOCIL			3,416
Other comprehensive income (loss), net of tax			3,445
End of period	(79,867)		(79,867)
Accumulated gain (loss) on derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			207
OCI before reclassifications			(703)
Amounts reclassified from AOCIL			(8)
Other comprehensive income (loss), net of tax			(711)
End of period	(504)		(504)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(151,796)	(241,995)	(157,719)	(202,812)
OCI before reclassifications			(7,036)
Amounts reclassified from AOCIL			3,408
Other comprehensive income (loss), net of tax	(9,551)	25,123	(3,628)	(14,060)
End of period	$ (161,347)	$ (216,872)	$ (161,347)	$ (216,872)