Segments (Operating Profit By Segment and Reconciliation to Consolidated Amounts) (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]
Operating Income											$ 449,606	$ 404,465	$ 344,038
Interest Expense	$ 17,790	$ 19,548	$ 16,248	$ 17,029	$ 16,757	$ 15,147	$ 35,796	$ 31,904	$ 53,586	$ 48,933	72,075	66,330	59,838
Equity-based compensation expense			4,325			4,165	8,020	7,212	12,669	11,301	16,708	14,959	10,582
Pension settlement											0	0	12,542
Non-service pension expense (income)											7,719	12,685	12,324
Corporate expenses and other											40,456	40,745	27,232
Earnings before income taxes	76,353	72,058	74,435	74,513	71,567	68,900	146,493	140,467	222,846	214,980	312,648	269,746	221,520
Depreciation and amortization											103,728	96,027	89,304
Assets	$ 4,384,020	$ 4,307,055	$ 4,181,848	$ 4,080,387	$ 4,041,682	$ 3,980,265	$ 4,307,055	$ 4,041,682	$ 4,384,020	$ 4,080,387	4,426,055	4,077,647	3,768,347
Capital expenditures											$ 144,731	151,995	177,309
Non-service pension expense											Other Nonoperating Income (Expense)
Space And Defense
Segment Reporting Information [Line Items]
Operating Income											$ 131,137	126,885	96,107
Depreciation and amortization											24,937	21,895	20,067
Assets											1,213,618	1,035,716	1,011,724
Capital expenditures											59,162	47,170	66,613
Military Aircraft
Segment Reporting Information [Line Items]
Operating Income											98,757	85,503	60,625
Depreciation and amortization											34,424	31,327	30,449
Assets											1,041,046	961,056	866,590
Capital expenditures											37,422	52,741	47,699
Commercial Aircraft
Segment Reporting Information [Line Items]
Operating Income											111,793	98,877	86,037
Depreciation and amortization											18,780	16,116	12,678
Assets											1,052,419	953,053	779,949
Capital expenditures											23,283	28,750	31,887
Industrial
Segment Reporting Information [Line Items]
Operating Income											107,919	93,200	101,269
Depreciation and amortization											25,420	26,482	25,897
Assets											1,102,533	1,098,953	1,086,818
Capital expenditures											24,787	23,290	30,949
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization											167	207	213
Assets											16,439	28,869	23,266
Capital expenditures											$ 77	$ 44	$ 161