CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Cash flows from operating activities:
Net earnings	$ 55,001	$ 42,721
Adjustments to reconcile net earnings to net cash flows from operations:
Depreciation and amortization	21,031	20,343
Noncash loss (gain) on trading securities	0	32
Stock-based compensation	4,671	3,325
Defined benefit pension plan benefit	(3,676)	(1,763)
Contribution to defined benefit pension plan	(964)	(17,039)
Loss on sale of property, plant and equipment	60	53
Equity in loss in nonconsolidated subsidiaries	360	219
Deferred income taxes	6,955	8,177
Changes in assets and liabilities:
Receivables	16,044	(27,116)
Inventories	(67,386)	(8,674)
Prepaid expenses and other assets (current and non-current)	(22,514)	(10,149)
Contract assets	5,118	(3,933)
Accounts payable	24,605	13,880
Accrued expenses	(35,559)	5,716
Contract liabilities	20,051	33,089
Other noncurrent liabilities	4,215	(2,971)
Income taxes payable/refundable	5,141	6,442
Net cash flows from operating activities	33,153	62,352
Cash flows from investing activities:
Purchase of property, plant and equipment	(27,565)	(23,580)
Proceeds from sale of assets	204	684
Acquisitions, net of cash acquired	0	(8,804)
Other, net	(1,947)	(1,436)
Net cash flows from investing activities	(29,308)	(33,136)
Cash flows from financing activities:
Proceeds from short-term agreements	14,734	3,751
Payments on short-term agreements	(10,759)	(5,193)
Proceeds from long-term borrowings	4,181	10,000
Principal payments on long-term borrowings	(712)	(188)
Dividends paid	(9,556)	(8,079)
Dividends to noncontrolling interest	0	(5,342)
Purchase of noncontrolling interest	0	(53,534)
Purchase of treasury shares	(11,131)	(20,481)
Proceeds from exercises under stock plans	19,318	60
Purchase of common treasury shares—stock plan exercises	(16,725)	(3)
Net cash flows from financing activities	(10,650)	(79,009)
Effect of exchange rate changes on cash and cash equivalents	(2,463)	(9,104)
Net change in cash and cash equivalents	(9,268)	(58,897)
Cash and cash equivalents—beginning of year	400,726	353,542
Cash and cash equivalents—end of period	$ 391,458	$ 294,645