Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 28, 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
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	$ 57,526	$ 52,635	$ 112,136	$ 107,141	$ 170,622	$ 166,252	$ 235,028	$ 208,786	$ 175,156
Adjustments to reconcile net earnings to net cash provided (used) by operating activities:
Depreciation	22,429	20,695	44,779	41,702	68,252	63,334	94,013	85,878	77,763
Amortization	2,323	2,720	4,629	5,296	6,996	7,677	9,715	10,149	11,541
Deferred income taxes	(4,261)	(3,519)	(12,824)	(18,393)	(19,642)	(26,458)	(6,545)	(29,651)	(34,997)
Equity-based compensation expense	4,325	4,165	8,020	7,212	12,669	11,301	16,708	14,959	10,582
Loss on sale of businesses							0	0	900
Asset Impairment and Inventory Write-Down				6,925	10,988	8,637	13,848	29,176	18,973
Gain on sale of buildings							0	(979)	(10,030)
Pension settlement							0	0	12,542
Other	1,401	(2,478)	2,291	2,207	3,648	5,374	4,432	6,283	6,244
Changes in assets and liabilities providing (using) cash:
Receivables	(63,037)	71,587	(123,555)	30,169	(105,346)	(5,977)	(87,070)	35,962	(69,275)
Unbilled receivables	(36,140)	(105,723)	(31,216)	(137,181)	(37,642)	(108,731)	(64,588)	(50,474)	(35,423)
Inventories	(48,612)	(47,993)	(54,040)	(80,278)	(65,256)	(108,283)	(51,772)	(131,330)	(127,442)
Accounts payable	(22,973)	(5,752)	1,975	1,847	(4,201)	918	24,711	26,446	28,641
Contract advances and progress billings	(4,043)	105,234	8,501	65,091	9,009	13,582	81,597	(41,717)	39,448
Accrued expenses	(27,301)	(47,662)	(29,523)	(7,672)	(4,796)	26,172	3,743	7,900	(3,185)
Accrued income taxes	(6,652)	12,760	(22,429)	11,202	(20,095)	10,444	(20,214)	14,502	23,644
Net pension and post retirement liabilities	636	2,957	12,067	5,687	14,644	8,783	18,194	11,791	13,940
Other assets and liabilities	(8,531)	2,296	(13,705)	(21,819)	(7,453)	(22,625)	1,286	181	629
Net cash provided (used) by operating activities	(132,910)	61,922	(92,894)	19,136	32,397	50,400	273,086	197,862	139,651
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisitions of businesses, net of cash acquired		(5,212)		(5,911)		(5,911)	(41,179)	(5,911)	0
Purchase of property, plant and equipment	(32,778)	(39,050)	(70,382)	(80,510)	(103,041)	(113,823)	(144,731)	(151,995)	(177,309)
Net proceeds from businesses sold	13,487		13,487		13,487	1,627	13,487	1,627	1,892
Net proceeds from buildings sold							0	1,453	19,702
Other investing transactions	169	(479)	(2,062)	(515)	(2,844)	(646)	(2,833)	(766)	(11,455)
Net cash provided (used) by investing activities	(19,122)	(44,741)	(58,957)	(86,936)	(92,398)	(118,753)	(175,256)	(155,592)	(167,170)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from revolving lines of credit	426,500	279,500	752,500	509,500	957,500	784,500	1,229,500	1,038,500	1,044,101
Payments on revolving lines of credit	(197,000)	(223,000)	(462,000)	(425,000)	(1,001,500)	(691,000)	(1,410,000)	(1,029,500)	(1,017,420)
Proceeds from long-term debt					250,000		250,000	0	0
Payments on long-term debt							0	0	(916)
Payments on finance lease obligations	(2,119)	(1,183)	(4,469)	(2,508)	(7,128)	(4,106)	(10,159)	(6,037)	(4,313)
Payment of dividends	(8,961)	(8,619)	(18,106)	(17,572)	(27,247)	(26,521)	(36,430)	(35,476)	(34,074)
Proceeds from sale of treasury stock		581	7,825	7,579	10,970	7,579	19,568	15,685	19,785
Purchase of outstanding shares for treasury	(55,692)	(8,711)	(126,425)	(20,238)	(127,808)	(21,832)	(142,707)	(36,738)	(29,306)
Proceeds from sale of stock held by SECT	9,665	5,001	19,289	15,788	20,287	16,670	32,664	28,202	15,713
Purchase of stock held by SECT	(8,087)	(4,561)	(14,808)	(9,407)	(18,505)	(14,296)	(28,985)	(22,837)	(14,251)
Other financing transactions	(439)		(1,457)		(1,600)		(1,742)	0	(2,027)
Net cash provided (used) by financing activities	163,867	39,008	152,349	58,142	54,969	50,994	(98,291)	(48,201)	(22,708)
Effect of exchange rate changes on cash	(2,564)	1,495	(2,309)	245	(491)	(267)	(1,863)	1,324	2,043
Increase (decrease) in cash, cash equivalents and restricted cash	9,271	57,684	(1,811)	(9,413)	(5,523)	(17,626)	(2,324)	(4,607)	(48,184)
Cash, cash equivalents and restricted cash at beginning of year(1)	64,537	69,144	64,537	69,144	64,537	69,144	64,537	69,144	117,328
Cash, cash equivalents and restricted cash at end of year (1)	73,808	126,828	62,726	59,731	59,014	51,518	62,213	64,537	69,144
(1) Cash related to assets held for sale included in ending cash flow cash balance Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents								2,720
SUPPLEMENTAL CASH FLOW INFORMATION
Interest paid							70,977	65,382	59,453
Income taxes paid, net of refunds							100,347	78,482	69,253
Treasury shares issued as compensation	3,186	2,574	6,288	5,325	6,288	5,323	6,289	5,323	4,174
Assets acquired through lease financing	$ 17,172	$ 8,133	$ 23,999	$ 19,716	$ 35,657	$ 28,910	$ 47,014	$ 39,383	$ 64,034