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BUSINESS COMBINATION (Details) (USD $) | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2011 | Dec. 27, 2013 | Dec. 31, 2010 | Aug. 31, 2011 Willdan Energy Solutions | Sep. 30, 2010 Willdan Energy Solutions | Aug. 31, 2009 Willdan Energy Solutions | Dec. 27, 2013 Willdan Energy Solutions | Dec. 28, 2012 Willdan Energy Solutions | Jun. 30, 2009 Willdan Energy Solutions
BUSINESS COMBINATION |  |  |  |  |  |  |  |  |
Acquisition cost |  |  |  |  |  |  | $ 17,900,000 |  |
Cash paid at closing |  |  |  |  |  |  | 9,900,000 |  |
Net asset value adjustment |  |  |  |  |  |  | 200,000 |  |
Guaranteed payment in cash |  |  |  |  |  |  |  |  | 1,000,000
Earn-out payment | 2,733,000 |  |  | 2,700,000 | 2,100,000 | 1,300,000 |  |  |
Transaction costs |  |  |  |  |  |  | 700,000 |  |
Goodwill associated with the acquisition | $ 15,208,000 | $ 0 | $ 12,475,000 |  |  |  |  | $ 15,200,000 |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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