Segments (Segment Sales by Customer) (Details) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 28, 2025	Mar. 29, 2025	Dec. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Mar. 29, 2025	Mar. 30, 2024	Jun. 28, 2025	Jun. 29, 2024	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 969,582	$ 934,022	$ 907,882	$ 914,135	$ 920,208	$ 855,222	$ 1,841,904	$ 1,775,430	$ 2,811,486	$ 2,689,565	$ 3,860,624	$ 3,608,960	$ 3,316,190
Commercial
Segment Reporting Information [Line Items]
Net sales											1,974,237	1,895,807	1,711,522
U.S. Government (including OEM)
Segment Reporting Information [Line Items]
Net sales											1,461,417	1,347,183	1,289,227
Other
Segment Reporting Information [Line Items]
Net sales											424,970	365,970	315,441
Space And Defense
Segment Reporting Information [Line Items]
Net sales											1,113,028	1,018,148	947,251
Space And Defense | Commercial
Segment Reporting Information [Line Items]
Net sales											187,528	172,829	112,777
Space And Defense | U.S. Government (including OEM)
Segment Reporting Information [Line Items]
Net sales											798,956	754,057	778,229
Space And Defense | Other
Segment Reporting Information [Line Items]
Net sales											126,544	91,262	56,245
Military Aircraft
Segment Reporting Information [Line Items]
Net sales											888,136	811,566	720,332
Military Aircraft | U.S. Government (including OEM)
Segment Reporting Information [Line Items]
Net sales											657,813	582,688	505,794
Military Aircraft | Other
Segment Reporting Information [Line Items]
Net sales											230,323	228,878	214,538
Commercial Aircraft
Segment Reporting Information [Line Items]
Net sales											903,879	788,100	665,883
Commercial Aircraft | Commercial
Segment Reporting Information [Line Items]
Net sales											853,045	751,110	632,878
Commercial Aircraft | Other
Segment Reporting Information [Line Items]
Net sales											50,834	36,990	33,005
Industrial
Segment Reporting Information [Line Items]
Net sales											955,581	991,146	982,724
Industrial | Commercial
Segment Reporting Information [Line Items]
Net sales											933,664	971,868	965,867
Industrial | U.S. Government (including OEM)
Segment Reporting Information [Line Items]
Net sales											4,648	10,438	5,204
Industrial | Other
Segment Reporting Information [Line Items]
Net sales											$ 17,269	$ 8,840	$ 11,653