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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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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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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.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Represents the net asset value adjustment recorded as part of the acquisition cost.

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