CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended			103 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020	Dec. 31, 2022
Cash flows from operating activities:
Net earnings	$ 254,251	$ 197,725	$ 142,149
Adjustments to reconcile net earnings to net cash flows from operations:
Depreciation and amortization	97,167	92,577	82,892
Noncash loss on trading securities			39
Contribution to defined benefit pension plan	(17,155)	(1,924)	(35,399)
Loss from divestiture of offshore wind energy structures business	33,273
Impairment of long-lived assets		27,911	20,389
Stock-based compensation	41,850	28,720	14,874
Defined benefit pension plan benefit	(10,087)	(14,567)	(7,311)
Loss (gain) on sale of property, plant and equipment	237	(961)	60
Equity in loss in nonconsolidated subsidiaries	950	944	1,004
Deferred income taxes	(1,225)	71	(1,397)
Changes in assets and liabilities:
Receivables	(74,163)	(69,275)	(24,403)
Inventories	(3,429)	(289,942)	(21,888)
Prepaid expenses and other assets (current and non-current)	26,625	(36,066)	(10,633)
Contract assets	(53,008)	(21,579)	19,835
Accounts payable	36,990	89,418	33,044
Accrued expenses	624	30,556	52,548
Contract liabilities	(567)	6,589	12,072
Other noncurrent liabilities	(16,904)	20,181	46,712
Income taxes payable / refundable	10,836	5,560	(8,293)
Net cash flows from operating activities	326,265	65,938	316,294
Cash flows from investing activities:
Purchase of property, plant, and equipment	(93,288)	(107,790)	(106,700)
Proceeds from sale of assets	1,582	1,745	10,860
Acquisitions, net of cash acquired	(39,287)	(312,500)	(15,862)
Proceeds from settlement of net investment hedge			11,983
Investments in nonconsolidated subsidiaries			(1,283)
Other, net	(1,087)	1,237	(3,027)
Net cash flows from investing activities	(132,080)	(417,308)	(104,029)
Cash flows from financing activities:
Proceeds from short-term borrowings	9,665	5,821	20,990
Payments on short-term borrowings	(17,242)	(26,062)	(7,946)
Proceeds from long-term borrowings	253,999	312,485	88,872
Principal payments on long-term borrowings	(336,403)	(91,313)	(121,665)
Proceeds from settlement of financial derivatives	3,532
Debt issuance costs		(2,267)
Dividends paid	(45,813)	(41,412)	(36,930)
Dividends to noncontrolling interest	(714)		(5,642)
Purchase of noncontrolling interests	(7,338)		(59,416)
Purchase of treasury shares	(40,474)	(26,100)	(56,491)	$ (918,600)
Proceeds from exercises under stock plans	16,849	23,895	18,961
Purchase of common treasury shares-stock plan exercises	(17,966)	(21,547)	(14,489)
Net cash flows from financing activities	(181,905)	133,500	(173,756)
Effect of exchange rate changes on cash and cash equivalents	(4,106)	(5,624)	8,675
Net change in cash and cash equivalents	8,174	(223,494)	47,184
Cash and cash equivalents-beginning of year	177,232	400,726	353,542
Cash and cash equivalents-end of period	$ 185,406	$ 177,232	$ 400,726	$ 185,406