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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended
--- | ---
Dec. 27, 2013 | Dec. 28, 2012 | Dec. 30, 2011
Fiscal Period |  |  |
Length of fiscal year | 364 days | 364 days | 364 days
Minimum |  |  |
Fiscal Period |  |  |
Length of fiscal year | 364 days |  |
Maximum |  |  |
Fiscal Period |  |  |
Length of fiscal year | 371 days |  |

X
- Definition Represents the length of the fiscal year of the entity. + References No definition available. + Details
Name: | wldn_LengthOfFiscalYear
Namespace Prefix: | wldn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | wldn_SignificantAccountingPoliciesLineItems
Namespace Prefix: | wldn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration