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COMMITMENTS (Details) | 9 Months Ended
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Sep. 28, 2012
Employee Benefit Plans |
Limit of contribution to 401(k) plan as a percentage of employees' compensation | 50.00%

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The limit of employee contributions to the plan as a percentage of employees' compensation, as allowed by tax laws. + References No definition available. + Details
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Namespace Prefix: | wldn_
Data Type: | num:percentItemType
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Period Type: | duration