Segments (Sales by Market Type) (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
Space And Defense
Segment Reporting Information [Line Items]
Net sales											1,113,028	1,018,148	947,251
Space And Defense | Space
Segment Reporting Information [Line Items]
Net sales											474,517	434,936	407,009
Space And Defense | Defense
Segment Reporting Information [Line Items]
Net sales											638,511	583,212	540,242
Military Aircraft
Segment Reporting Information [Line Items]
Net sales											888,136	811,566	720,332
Military Aircraft | Original Equipment Manufacturers
Segment Reporting Information [Line Items]
Net sales											687,261	624,575	536,562
Military Aircraft | Aftermarket
Segment Reporting Information [Line Items]
Net sales											200,875	186,991	183,770
Commercial Aircraft
Segment Reporting Information [Line Items]
Net sales											903,879	788,100	665,883
Commercial Aircraft | Original Equipment Manufacturers
Segment Reporting Information [Line Items]
Net sales											572,971	524,699	431,521
Commercial Aircraft | Aftermarket
Segment Reporting Information [Line Items]
Net sales											330,908	263,401	234,362
Industrial
Segment Reporting Information [Line Items]
Net sales											955,581	991,146	982,724
Industrial | Energy
Segment Reporting Information [Line Items]
Net sales											141,679	137,854	123,864
Industrial | Industrial Automation
Segment Reporting Information [Line Items]
Net sales											401,697	443,580	485,502
Industrial | Simulation and Test
Segment Reporting Information [Line Items]
Net sales											141,551	155,889	124,980
Industrial | Medical
Segment Reporting Information [Line Items]
Net sales											$ 270,654	$ 253,823	$ 248,378