XML 44 R34.htm IDEA: XBRL DOCUMENT
v3.5.0.2

RESTRUCTURING ACTIVITIES - Narrative (Details) - Broad Restructuring Plan - USD ($) $ in Thousands | Dec. 26, 2015 | Sep. 26, 2015
--- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and related cost, expected cost remaining | $ 39,852 | $ 8,800
Asset impairments/net loss on disposals |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and related cost, expected cost remaining | 19,836 |
Cost of Sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and related cost, expected cost remaining | 21,708 | 4,810
Cost of Sales | Other cash restructuring expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and related cost, expected cost remaining |  | 1,596
Cost of Sales | Asset impairments/net loss on disposals |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and related cost, expected cost remaining |  | 1,481
Cost of Sales | Severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and related cost, expected cost remaining |  | 1,733
Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and related cost, expected cost remaining | $ 18,144 | 3,990
Selling, General and Administrative Expenses | Other cash restructuring expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and related cost, expected cost remaining |  | 238
Selling, General and Administrative Expenses | Asset impairments/net loss on disposals |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and related cost, expected cost remaining |  | 1,815
Selling, General and Administrative Expenses | Severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and related cost, expected cost remaining |  | $ 1,937

X
- Definition Amount of expected cost remaining for the specified restructuring cost. + References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RestructuringPlanAxis=vmi_BroadRestructuringPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=vmi_AssetImpairmentNetLossOnDisposalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |