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GUARANTOR/NON-GUARANTOR FINANCIAL INFORMATION (Details 5) - USD ($) | 12 Months Ended | 56 Months Ended |
--- | --- | --- | ---
Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 29, 2018 | Dec. 26, 2015
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |  |
Defined benefit pension plan expense (benefit) | $ (2,251,000) | $ 648,000 | $ 1,870,000 |  |
Cash flows from operating activities: |  |  |  |  |
Net earnings | 100,306,000 | 122,319,000 | 178,391,000 |  |
Adjustments to reconcile net earnings to net cash flows from operations: |  |  |  |  |
Depreciation and amortization | 82,827,000 | 84,957,000 | 82,417,000 |  |
Noncash loss on trading securities | (62,000) | 237,000 | 586,000 |  |
Impairment of property, plant and equipment | 5,000,000 | 0 | 1,099,000 |  |
Impairment of property, plant and equipment | 15,780,000 | 0 | 0 |  |
Loss from divestiture of grinding media business | 6,084,000 | 0 | 0 |  |
Stock-based compensation | 10,392,000 | 10,706,000 | 9,931,000 |  |
Contribution to defined benefit pension plan | (1,537,000) | (40,245,000) | (1,488,000) |  |
(Gain) loss on sale of property, plant and equipment | (225,000) | (3,924,000) | 631,000 |  |
Equity in earnings in nonconsolidated subsidiaries | 0 | 0 | 0 |  |
Deferred income taxes | (1,659,000) | 39,755,000 | (23,685,000) |  |
Net working capital | 46,620,000 | 75,185,000 | (2,196,000) |  |
Changes in assets and liabilities (net of acquisitions): |  |  |  |  |
Inventories | (13,774,000) | (57,442,000) | (11,461,000) |  |
Prepaid expenses | (11,048,000) | (6,214,000) | (1,925,000) |  |
Accounts payable | (1,486,000) | 39,405,000 | 104,000 |  |
Accrued expenses | 49,000 | (1,998,000) | (12,207,000) |  |
Other noncurrent liabilities | (10,888,000) | (7,228,000) | (23,880,000) |  |
Income taxes payable (refundable) | (4,139,000) | 1,108,000 | 7,994,000 |  |
Net cash flows from operating activities | 153,008,000 | 133,148,000 | 232,820,000 |  |
Change in fair value of contingent consideration | 0 | 0 | (3,242,000) |  |
Cash flows from investing activities: |  |  |  |  |
Purchase of property, plant and equipment | (71,985,000) | (55,266,000) | (57,920,000) |  |
Proceeds from sale of assets | 63,103,000 | 8,185,000 | 5,126,000 |  |
Acquisitions, net of cash acquired | (143,020,000) | (5,362,000) | 0 |  |
Proceeds from settlement of net investment hedge | (1,621,000) | 5,123,000 | 0 |  |
Other, net | (1,922,000) | (2,295,000) | (255,000) |  |
Net cash flows used in investing activities | (155,445,000) | (49,615,000) | (53,049,000) |  |
Cash flows from financing activities: |  |  |  |  |
Borrowings (Payments) under short-term agreements | 10,543,000 | (585,000) | (200,000) |  |
Proceeds from long-term borrowings | 251,655,000 | 0 | 0 |  |
Principal payments on long-term borrowings | (262,191,000) | (887,000) | (2,006,000) |  |
Payments for Derivative Instrument, Financing Activities | 2,467,000 | 0 | 0 |  |
Dividends paid | (33,726,000) | (33,862,000) | (34,053,000) |  |
Dividends to noncontrolling interest | (7,055,000) | (5,674,000) | (2,938,000) |  |
Increase (Decrease) Payments of Intercompany Dividends | 0 | 0 |  |  |
vmi_ProceedsFromRepaymentOfIntercompanyCapitalContribution | 0 | 0 |  |  |
Purchase of noncontrolling interest | (5,510,000) | 0 | (11,009,000) |  |
Debt issuance costs | (2,322,000) | 0 | 0 |  |
Proceeds from exercises under stock plans | 7,357,000 | 35,159,000 | 11,153,000 |  |
Purchase of treasury shares | (114,805,000) | 0 | (53,800,000) | $ (732,600,000) |
Purchase of common treasury shares - stock plan exercises | (3,589,000) | (26,161,000) | (2,305,000) |  |
Net cash flows used in financing activities | (162,110,000) | (32,010,000) | (95,158,000) |  |
Effect of exchange rate changes on cash and cash equivalents | (15,048,000) | 27,682,000 | (20,087,000) |  |
Net change in cash and cash equivalents | (179,595,000) | 79,205,000 | 64,526,000 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 313,210,000 | 492,805,000 | 413,600,000 | 313,210,000 | $ 349,074,000
Eliminations |  |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |  |
Defined benefit pension plan expense (benefit) | 0 | 0 | 0 |  |
Cash flows from operating activities: |  |  |  |  |
Net earnings | (104,164,000) | (105,852,000) | (208,027,000) |  |
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 |  |
Impairment of property, plant and equipment | 0 |  | 0 |  |
Impairment of property, plant and equipment | 0 |  |  |  |
Loss from divestiture of grinding media business | 0 |  |  |  |
Stock-based compensation | 0 | 0 | 0 |  |
Contribution to defined benefit pension plan | 0 | 0 | 0 |  |
(Gain) loss on sale of property, plant and equipment | 0 | 0 | 0 |  |
Equity in earnings in nonconsolidated subsidiaries | 105,687,000 | 106,023,000 | 207,189,000 |  |
Deferred income taxes | 0 | 0 | 0 |  |
Net working capital | 1,769,000 | 306,000 | (1,160,000) |  |
Changes in assets and liabilities (net of acquisitions): |  |  |  |  |
Other noncurrent liabilities | 0 | 0 | 0 |  |
Income taxes payable (refundable) | 0 | 0 | 0 |  |
Net cash flows from operating activities | (246,000) | (135,000) | 322,000 |  |
Change in fair value of contingent consideration |  |  | 0 |  |
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 |  |  |
Proceeds from settlement of net investment hedge | 0 | 0 |  |  |
Other, net | 246,000 | 135,000 | (322,000) |  |
Net cash flows used in investing activities | 246,000 | 135,000 | (322,000) |  |
Cash flows from financing activities: |  |  |  |  |
Borrowings (Payments) under short-term agreements | 0 | 0 | 0 |  |
Proceeds from long-term borrowings | 0 |  |  |  |
Principal payments on long-term borrowings | 0 | 0 | 0 |  |
Payments for Derivative Instrument, Financing Activities | 0 |  |  |  |
Dividends paid | 0 | 0 | 0 |  |
Dividends to noncontrolling interest | 0 | 0 | 0 |  |
Increase (Decrease) Payments of Intercompany Dividends | 0 | 0 |  |  |
vmi_ProceedsFromRepaymentOfIntercompanyCapitalContribution | 0 | 0 |  |  |
Purchase of noncontrolling interest | 0 |  | 0 |  |
Debt issuance costs | 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, Restricted Cash and Restricted Cash Equivalents | 0 | 0 | 0 | 0 | 0
Parent |  |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |  |
Defined benefit pension plan expense (benefit) | 0 | 0 | 0 |  |
Cash flows from operating activities: |  |  |  |  |
Net earnings | 94,351,000 | 116,240,000 | 173,232,000 |  |
Adjustments to reconcile net earnings to net cash flows from operations: |  |  |  |  |
Depreciation and amortization | 26,155,000 | 26,237,000 | 27,096,000 |  |
Noncash loss on trading securities | 0 | 0 | 0 |  |
Impairment of property, plant and equipment | 0 |  | 0 |  |
Impairment of property, plant and equipment | 0 |  |  |  |
Loss from divestiture of grinding media business | (2,518,000) |  |  |  |
Stock-based compensation | 10,392,000 | 10,706,000 | 9,931,000 |  |
Contribution to defined benefit pension plan | 0 | 0 | 0 |  |
(Gain) loss on sale of property, plant and equipment | 57,000 | (664,000) | 165,000 |  |
Equity in earnings in nonconsolidated subsidiaries | (68,383,000) | (83,877,000) | (141,061,000) |  |
Deferred income taxes | 1,532,000 | 10,307,000 | 6,216,000 |  |
Net working capital | 17,681,000 | 23,943,000 | 12,335,000 |  |
Changes in assets and liabilities (net of acquisitions): |  |  |  |  |
Other noncurrent liabilities | (7,345,000) | (140,000) | (2,333,000) |  |
Income taxes payable (refundable) | (6,176,000) | (11,837,000) | 32,873,000 |  |
Net cash flows from operating activities | 35,420,000 | 43,029,000 | 93,784,000 |  |
Change in fair value of contingent consideration |  |  | 0 |  |
Cash flows from investing activities: |  |  |  |  |
Purchase of property, plant and equipment | (25,255,000) | (20,460,000) | (9,031,000) |  |
Proceeds from sale of assets | 44,000 | 748,000 | 44,000 |  |
Acquisitions, net of cash acquired | (57,805,000) | 0 |  |  |
Proceeds from settlement of net investment hedge | (1,621,000) | 5,123,000 |  |  |
Other, net | 69,714,000 | 684,000 | (633,000) |  |
Net cash flows used in investing activities | (14,923,000) | (13,905,000) | (9,620,000) |  |
Cash flows from financing activities: |  |  |  |  |
Borrowings (Payments) under short-term agreements | 0 | 0 | 0 |  |
Proceeds from long-term borrowings | 245,936,000 |  |  |  |
Principal payments on long-term borrowings | (261,219,000) | 0 | (215,000) |  |
Payments for Derivative Instrument, Financing Activities | 2,467,000 |  |  |  |
Dividends paid | (33,726,000) | (33,862,000) | (34,053,000) |  |
Dividends to noncontrolling interest | 0 | 0 | 0 |  |
Increase (Decrease) Payments of Intercompany Dividends | (168,757,000) | (22,662,000) |  |  |
vmi_ProceedsFromRepaymentOfIntercompanyCapitalContribution | (3,492,000) | 10,818,000 |  |  |
Purchase of noncontrolling interest | 0 |  | 0 |  |
Debt issuance costs | (2,322,000) |  |  |  |
Proceeds from exercises under stock plans | 7,357,000 | 35,159,000 | 11,153,000 |  |
Purchase of treasury shares | (114,805,000) |  | (53,800,000) |  |
Purchase of common treasury shares - stock plan exercises | (3,589,000) | (26,161,000) | (2,305,000) |  |
Net cash flows used in financing activities | 430,000 | (13,020,000) | (79,220,000) |  |
Effect of exchange rate changes on cash and cash equivalents | 0 | 0 | 0 |  |
Net change in cash and cash equivalents | 20,927,000 | 16,104,000 | 4,944,000 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 104,256,000 | 83,329,000 | 67,225,000 | 104,256,000 | 62,281,000
Guarantors |  |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |  |
Defined benefit pension plan expense (benefit) | 0 | 0 | 0 |  |
Cash flows from operating activities: |  |  |  |  |
Net earnings | 77,679,000 | 52,562,000 | 104,625,000 |  |
Adjustments to reconcile net earnings to net cash flows from operations: |  |  |  |  |
Depreciation and amortization | 13,959,000 | 15,003,000 | 13,316,000 |  |
Noncash loss on trading securities | 0 | 0 | 0 |  |
Impairment of property, plant and equipment | 0 |  | 0 |  |
Impairment of property, plant and equipment | 0 |  |  |  |
Loss from divestiture of grinding media business | 0 |  |  |  |
Stock-based compensation | 0 | 0 | 0 |  |
Contribution to defined benefit pension plan | 0 | 0 | 0 |  |
(Gain) loss on sale of property, plant and equipment | (37,000) | 8,000 | 103,000 |  |
Equity in earnings in nonconsolidated subsidiaries | (37,304,000) | (22,146,000) | (66,128,000) |  |
Deferred income taxes | 1,791,000 | 0 | 0 |  |
Net working capital | 13,962,000 | 25,717,000 | 5,939,000 |  |
Changes in assets and liabilities (net of acquisitions): |  |  |  |  |
Other noncurrent liabilities | 615,000 | 0 | 5,000 |  |
Income taxes payable (refundable) | (1,303,000) | 728,000 | (16,567,000) |  |
Net cash flows from operating activities | 41,438,000 | 20,438,000 | 29,415,000 |  |
Change in fair value of contingent consideration |  |  | 0 |  |
Cash flows from investing activities: |  |  |  |  |
Purchase of property, plant and equipment | (13,115,000) | (9,454,000) | (22,320,000) |  |
Proceeds from sale of assets | 268,000 | 3,000 | 102,000 |  |
Acquisitions, net of cash acquired | 0 | 0 |  |  |
Proceeds from settlement of net investment hedge | 0 | 0 |  |  |
Other, net | (42,667,000) | (22,777,000) | (5,085,000) |  |
Net cash flows used in investing activities | (55,514,000) | (32,228,000) | (27,303,000) |  |
Cash flows from financing activities: |  |  |  |  |
Borrowings (Payments) under short-term agreements | 0 | 0 | 0 |  |
Proceeds from long-term borrowings | 0 |  |  |  |
Principal payments on long-term borrowings | 0 | 0 | 0 |  |
Payments for Derivative Instrument, Financing Activities | 0 |  |  |  |
Dividends paid | 0 | 0 | 0 |  |
Dividends to noncontrolling interest | 0 | 0 | 0 |  |
Increase (Decrease) Payments of Intercompany Dividends | (11,296,000) | 0 |  |  |
vmi_ProceedsFromRepaymentOfIntercompanyCapitalContribution | 3,492,000 | (10,818,000) |  |  |
Purchase of noncontrolling interest | 0 |  | 0 |  |
Debt issuance costs | 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 | 14,788,000 | 10,818,000 | 0 |  |
Effect of exchange rate changes on cash and cash equivalents | (498,000) | 205,000 | (49,000) |  |
Net change in cash and cash equivalents | 214,000 | (767,000) | 2,063,000 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 5,518,000 | 5,304,000 | 6,071,000 | 5,518,000 | 4,008,000
Non- Guarantors |  |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |  |
Defined benefit pension plan expense (benefit) | (2,251,000) | 648,000 | 1,870,000 |  |
Cash flows from operating activities: |  |  |  |  |
Net earnings | 32,440,000 | 59,369,000 | 108,561,000 |  |
Adjustments to reconcile net earnings to net cash flows from operations: |  |  |  |  |
Depreciation and amortization | 42,713,000 | 43,717,000 | 42,005,000 |  |
Noncash loss on trading securities | (62,000) | 237,000 | 586,000 |  |
Impairment of property, plant and equipment | 5,000,000 |  | 1,099,000 |  |
Impairment of property, plant and equipment | 15,780,000 |  |  |  |
Loss from divestiture of grinding media business | (3,566,000) |  |  |  |
Stock-based compensation | 0 | 0 | 0 |  |
Contribution to defined benefit pension plan | 1,537,000 | (40,245,000) | (1,488,000) |  |
(Gain) loss on sale of property, plant and equipment | (245,000) | (3,268,000) | 363,000 |  |
Equity in earnings in nonconsolidated subsidiaries | 0 | 0 | 0 |  |
Deferred income taxes | (4,982,000) | 29,448,000 | (29,901,000) |  |
Net working capital | 13,208,000 | 25,219,000 | (19,310,000) |  |
Changes in assets and liabilities (net of acquisitions): |  |  |  |  |
Other noncurrent liabilities | (4,158,000) | (7,088,000) | (21,552,000) |  |
Income taxes payable (refundable) | 3,340,000 | 12,217,000 | (8,312,000) |  |
Net cash flows from operating activities | 76,396,000 | 69,816,000 | 109,299,000 |  |
Change in fair value of contingent consideration |  |  | (3,242,000) |  |
Cash flows from investing activities: |  |  |  |  |
Purchase of property, plant and equipment | (33,615,000) | (25,352,000) | (26,569,000) |  |
Proceeds from sale of assets | 62,791,000 | 7,434,000 | 4,980,000 |  |
Acquisitions, net of cash acquired | (85,215,000) | (5,362,000) |  |  |
Proceeds from settlement of net investment hedge | 0 | 0 |  |  |
Other, net | (29,215,000) | 19,663,000 | 5,785,000 |  |
Net cash flows used in investing activities | (85,254,000) | (3,617,000) | (15,804,000) |  |
Cash flows from financing activities: |  |  |  |  |
Borrowings (Payments) under short-term agreements | 10,543,000 | (585,000) | (200,000) |  |
Proceeds from long-term borrowings | 5,719,000 |  |  |  |
Principal payments on long-term borrowings | (972,000) | (887,000) | (1,791,000) |  |
Payments for Derivative Instrument, Financing Activities | 0 |  |  |  |
Dividends paid | 0 | 0 | 0 |  |
Dividends to noncontrolling interest | (7,055,000) | (5,674,000) | (2,938,000) |  |
Increase (Decrease) Payments of Intercompany Dividends | 180,053,000 | 22,662,000 |  |  |
vmi_ProceedsFromRepaymentOfIntercompanyCapitalContribution | 0 | 0 |  |  |
Purchase of noncontrolling interest |  |  | (11,009,000) |  |
Debt issuance costs | 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 | (177,328,000) | (29,808,000) | (15,938,000) |  |
Effect of exchange rate changes on cash and cash equivalents | (14,550,000) | 27,477,000 | (20,038,000) |  |
Net change in cash and cash equivalents | (200,736,000) | 63,868,000 | 57,519,000 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 203,436,000 | $ 404,172,000 | $ 340,304,000 | $ 203,436,000 | $ 282,785,000
Non- Guarantors |  |  |  |  |
Cash flows from financing activities: |  |  |  |  |
Purchase of noncontrolling interest | $ (5,510,000) |  |  |  |

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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Period Type: | duration

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The cash outflow from the distribution of intercompany dividends. + References No definition available. + Details
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Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (Decrease) in Fair Value of Contingent Consideration + References No definition available. + Details
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Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net working capital + References No definition available. + Details
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Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow to reacquire common treasury shares issued under stock plans during the period. + References No definition available. + Details
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Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition vmi_ImpairmentOfPropertyPlantAndEquipment + References No definition available. + Details
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Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition vmi_ProceedsFromRepaymentOfIntercompanyCapitalContribution + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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- Details
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- Details
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- Details
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- Details
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