GUARANTOR/NON-GUARANTOR FINANCIAL INFORMATION (Details 4) - USD ($) $ in Thousands	12 Months Ended			68 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 28, 2019
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 from 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)
Equity in earnings in nonconsolidated subsidiaries	0	0	0
Deferred income taxes	3,940	(1,659)	39,755
Changes in assets and liabilities (net of acquisitions):
Net working capital	80,234	(46,620)	(75,185)
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 derivative		2,467
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)
Intercompany dividends	0	0	0
Purchase of noncontrolling interest	0	0	0
Intercompany interest on long-term note	0
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	$ (795,549)
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	353,542
Eliminations
Cash flows from operating activities:
Net earnings	(112,439)	(104,164)	(105,852)
Adjustments to reconcile net earnings to net cash flows from operations:
Depreciation and amortization	0	0	0
Noncash loss on trading securities	0	0	0
Contribution to defined benefit pension plan	0	0	0
Impairment of property, plant and equipment		0
Impairment of goodwill & intangible assets		0
Loss from divestiture of grinding media business		0
Stock-based compensation	0	0	0
Defined benefit pension plan expense (benefit)	0	0	0
(Gain) loss on sale of property, plant and equipment	0	0	0
Equity in earnings in nonconsolidated subsidiaries	112,082	105,687	106,023
Deferred income taxes	0	0	0
Changes in assets and liabilities (net of acquisitions):
Net working capital	355	(1,769)	(306)
Other noncurrent liabilities	0	0	0
Income taxes payable (refundable)	0	0	0
Net cash flows from operating activities	(2)	(246)	(135)
Cash flows from investing activities:
Purchase of property, plant and equipment	0	0	0
Proceeds from sale of assets	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from settlement of net investment hedge	0	0	0
Investments in nonconsolidated subsidiaries	0
Other, net	2	246	135
Net cash flows used in investing activities	2	246	135
Cash flows from financing activities:
Borrowings (payments) under short-term agreements	0	0	0
Proceeds from long-term borrowings	0	0
Principal payments on long-term borrowings	0	0	0
Settlement of financial derivative		0
Debt issuance costs		0
Dividends paid	0	0	0
Dividends to noncontrolling interest	0	0	0
Intercompany dividends	0	0	0
Purchase of noncontrolling interest	0	0	0
Intercompany interest on long-term note	0
Purchase of noncontrolling interest	0	0
Proceeds from exercises under stock plans	0	0	0
Purchase of treasury shares	0	0
Purchase of common treasury shares - stock plan exercises	0	0	0
Net cash flows used in financing activities	0	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net change in cash and cash equivalents	0	0	0
Cash, cash equivalents, and restricted cash—beginning of year	0	0	0
Cash, cash equivalents, and restricted cash—end of year	0	0	0	0
Parent
Cash flows from operating activities:
Net earnings	153,769	94,351	116,240
Adjustments to reconcile net earnings to net cash flows from operations:
Depreciation and amortization	26,734	26,155	26,237
Noncash loss on trading securities	0	0	0
Contribution to defined benefit pension plan	0	0	0
Impairment of property, plant and equipment		0
Impairment of goodwill & intangible assets		0
Loss from divestiture of grinding media business		2,518
Stock-based compensation	11,587	10,392	10,706
Defined benefit pension plan expense (benefit)	0	0	0
(Gain) loss on sale of property, plant and equipment	133	57	(664)
Equity in earnings in nonconsolidated subsidiaries	(104,182)	(68,383)	(83,877)
Deferred income taxes	(3,120)	1,532	10,307
Changes in assets and liabilities (net of acquisitions):
Net working capital	103,019	(17,681)	(23,943)
Other noncurrent liabilities	(505)	(7,345)	(140)
Income taxes payable (refundable)	1,714	(6,176)	(11,837)
Net cash flows from operating activities	189,149	35,420	43,029
Cash flows from investing activities:
Purchase of property, plant and equipment	(59,394)	(25,255)	(20,460)
Proceeds from sale of assets	87	44	748
Acquisitions, net of cash acquired	0	(57,805)	0
Proceeds from settlement of net investment hedge	11,184	(1,621)	5,123
Investments in nonconsolidated subsidiaries	(3,500)
Other, net	(14,964)	69,714	684
Net cash flows used in investing activities	(66,587)	(14,923)	(13,905)
Cash flows from financing activities:
Borrowings (payments) under short-term agreements	0	0	0
Proceeds from long-term borrowings	31,000	245,936
Principal payments on long-term borrowings	(10,000)	(261,219)	0
Settlement of financial derivative		2,467
Debt issuance costs		(2,322)
Dividends paid	(32,642)	(33,726)	(33,862)
Dividends to noncontrolling interest	0	0	0
Intercompany dividends	65,651	168,757	22,662
Purchase of noncontrolling interest	(13,284)	(3,492)	(10,818)
Intercompany interest on long-term note	0
Purchase of noncontrolling interest	(22,805)	0
Proceeds from exercises under stock plans	13,619	7,357	35,159
Purchase of treasury shares	(62,915)	(114,805)
Purchase of common treasury shares - stock plan exercises	(12,989)	(3,589)	(26,161)
Net cash flows used in financing activities	(44,365)	430	(13,020)
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net change in cash and cash equivalents	78,197	20,927	16,104
Cash, cash equivalents, and restricted cash—beginning of year	104,256	83,329	67,225
Cash, cash equivalents, and restricted cash—end of year	182,453	104,256	83,329	182,453
Guarantors
Cash flows from operating activities:
Net earnings	75,581	77,679	52,562
Adjustments to reconcile net earnings to net cash flows from operations:
Depreciation and amortization	13,518	13,959	15,003
Noncash loss on trading securities	0	0	0
Contribution to defined benefit pension plan	0	0	0
Impairment of property, plant and equipment		0
Impairment of goodwill & intangible assets		0
Loss from divestiture of grinding media business		0
Stock-based compensation	0	0	0
Defined benefit pension plan expense (benefit)	0	0	0
(Gain) loss on sale of property, plant and equipment	240	(37)	8
Equity in earnings in nonconsolidated subsidiaries	(7,900)	(37,304)	(22,146)
Deferred income taxes	0	1,791	0
Changes in assets and liabilities (net of acquisitions):
Net working capital	(36,781)	(13,962)	(25,717)
Other noncurrent liabilities	(5)	615	0
Income taxes payable (refundable)	(2,012)	(1,303)	728
Net cash flows from operating activities	42,641	41,438	20,438
Cash flows from investing activities:
Purchase of property, plant and equipment	(1,592)	(13,115)	(9,454)
Proceeds from sale of assets	48	268	3
Acquisitions, net of cash acquired	(63,141)	0	0
Proceeds from settlement of net investment hedge	0	0	0
Investments in nonconsolidated subsidiaries	0
Other, net	14,210	(42,667)	(22,777)
Net cash flows used in investing activities	(50,475)	(55,514)	(32,228)
Cash flows from financing activities:
Borrowings (payments) under short-term agreements	0	0	0
Proceeds from long-term borrowings	0	0
Principal payments on long-term borrowings	0	0	0
Settlement of financial derivative		0
Debt issuance costs		0
Dividends paid	0	0	0
Dividends to noncontrolling interest	0	0	0
Intercompany dividends	53,676	11,296	0
Purchase of noncontrolling interest	0	3,492	10,818
Intercompany interest on long-term note	(45,155)
Purchase of noncontrolling interest	0	0
Proceeds from exercises under stock plans	0	0	0
Purchase of treasury shares	0	0
Purchase of common treasury shares - stock plan exercises	0	0	0
Net cash flows used in financing activities	8,521	14,788	10,818
Effect of exchange rate changes on cash and cash equivalents	(36)	(498)	205
Net change in cash and cash equivalents	651	214	(767)
Cash, cash equivalents, and restricted cash—beginning of year	5,518	5,304	6,071
Cash, cash equivalents, and restricted cash—end of year	6,169	5,518	5,304	6,169
Non- Guarantors
Cash flows from operating activities:
Net earnings	42,555	32,440	59,369
Adjustments to reconcile net earnings to net cash flows from operations:
Depreciation and amortization	42,012	42,713	43,717
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		5,000
Impairment of goodwill & intangible assets		15,780
Loss from divestiture of grinding media business		3,566
Stock-based compensation	0	0	0
Defined benefit pension plan expense (benefit)	(513)	(2,251)	648
(Gain) loss on sale of property, plant and equipment	(2,886)	(245)	(3,268)
Equity in earnings in nonconsolidated subsidiaries	0	0	0
Deferred income taxes	7,060	(4,982)	29,448
Changes in assets and liabilities (net of acquisitions):
Net working capital	13,641	(13,208)	(25,219)
Other noncurrent liabilities	(764)	(4,158)	(7,088)
Income taxes payable (refundable)	(6,646)	3,340	12,217
Net cash flows from operating activities	75,826	76,396	69,816
Cash flows from investing activities:
Purchase of property, plant and equipment	(36,439)	(33,615)	(25,352)
Proceeds from sale of assets	5,421	62,791	7,434
Acquisitions, net of cash acquired	(18,700)	(85,215)	(5,362)
Proceeds from settlement of net investment hedge	0	0	0
Investments in nonconsolidated subsidiaries	(2,669)
Other, net	1,297	(29,215)	19,663
Net cash flows used in investing activities	(51,090)	(85,254)	(3,617)
Cash flows from financing activities:
Borrowings (payments) under short-term agreements	11,327	10,543	(585)
Proceeds from long-term borrowings	0	5,719
Principal payments on long-term borrowings	(768)	(972)	(887)
Settlement of financial derivative		0
Debt issuance costs		0
Dividends paid	0	0	0
Dividends to noncontrolling interest	(7,737)	(7,055)	(5,674)
Intercompany dividends	(119,327)	(180,053)	(22,662)
Purchase of noncontrolling interest	13,284	0	0
Intercompany interest on long-term note	45,155
Purchase of noncontrolling interest	(5,040)	(5,510)
Proceeds from exercises under stock plans	0	0	0
Purchase of treasury shares	0	0
Purchase of common treasury shares - stock plan exercises	0	0	0
Net cash flows used in financing activities	(63,106)	(177,328)	(29,808)
Effect of exchange rate changes on cash and cash equivalents	(146)	(14,550)	27,477
Net change in cash and cash equivalents	(38,516)	(200,736)	63,868
Cash, cash equivalents, and restricted cash—beginning of year	203,436	404,172	340,304
Cash, cash equivalents, and restricted cash—end of year	$ 164,920	$ 203,436	$ 404,172	$ 164,920