CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Cash flows from operating activities:
Net earnings	$ 159,466	$ 100,306	$ 122,319
Adjustments to reconcile net earnings to net cash flows from operations:
Depreciation and amortization	82,264	82,827	84,957
Noncash loss on trading securities	172	62	(237)
Contribution to defined benefit pension plan	(18,461)	(1,537)	(40,245)
Impairment of property, plant and equipment	0	5,000	0
Impairment of goodwill & intangible assets	0	15,780	0
Loss on divestiture of grinding media business	0	6,084	0
Stock-based compensation	11,587	10,392	10,706
Defined benefit pension plan expense (benefit)	(513)	(2,251)	648
(Gain) loss on sale of property, plant and equipment	(2,513)	(225)	(3,924)
Deferred income taxes	3,940	(1,659)	39,755
Changes in assets and liabilities (net of acquisitions):
Receivables	5,408	12,571	(49,112)
Inventories	12,313	(13,774)	(57,442)
Prepaid expenses	4,413	(11,048)	(6,214)
Contract asset - costs and profits in excess of billings	(29,274)	(32,932)	176
Accounts payable	(21,410)	(1,486)	39,405
Accrued expenses	108,784	49	(1,998)
Other noncurrent liabilities	(1,274)	(10,888)	(7,228)
Income taxes payable (refundable)	(6,944)	(4,139)	1,108
Net cash flows from operating activities	307,614	153,008	133,148
Cash flows from investing activities:
Purchase of property, plant and equipment	(97,425)	(71,985)	(55,266)
Proceeds from sale of assets	5,556	63,103	8,185
Acquisitions, net of cash acquired	(81,841)	(143,020)	(5,362)
Proceeds from settlement of net investment hedge	11,184	(1,621)	5,123
Investments in nonconsolidated subsidiaries	(6,169)	0	0
Other, net	545	(1,922)	(2,295)
Net cash flows used in investing activities	(168,150)	(155,445)	(49,615)
Cash flows from financing activities:
Borrowings (payments) under short-term agreements	11,327	10,543	(585)
Proceeds from long-term borrowings	31,000	251,655	0
Principal payments on long-term borrowings	(10,768)	(262,191)	(887)
Settlement of financial derivatives	0	(2,467)	0
Debt issuance costs	0	(2,322)	0
Dividends paid	(32,642)	(33,726)	(33,862)
Dividends to noncontrolling interest	(7,737)	(7,055)	(5,674)
Purchase of noncontrolling interest	(27,845)	(5,510)	0
Proceeds from exercises under stock plans	13,619	7,357	35,159
Purchase of treasury shares	(62,915)	(114,805)	0
Purchase of common treasury shares—stock plan exercises	(12,989)	(3,589)	(26,161)
Net cash flows used in financing activities	(98,950)	(162,110)	(32,010)
Effect of exchange rate changes on cash and cash equivalents	(182)	(15,048)	27,682
Net change in cash and cash equivalents	40,332	(179,595)	79,205
Cash, cash equivalents, and restricted cash—beginning of year	313,210	492,805	413,600
Cash, cash equivalents, and restricted cash—end of year	$ 353,542	$ 313,210	$ 492,805