COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS (Details) (USD $)	Jan. 31, 2015	Apr. 30, 2014
Costs incurred on uncompleted contracts	$ 26,256,693	$ 14,457,907
Estimated contract earnings	5,426,254wpcs_GainLossOnEstimatedContract	3,291,077wpcs_GainLossOnEstimatedContract
Gross Total	31,682,947	17,748,984
Less: Billings to date	33,186,367	18,766,199
Total	(1,503,420)wpcs_CostsAndEstimatedEarningsContracts	(1,017,215)wpcs_CostsAndEstimatedEarningsContracts
Costs and estimated earnings in excess of billings on uncompleted contracts	340,097	431,348
Billings in excess of cost and estimated earnings on uncompleted contracts	$ 1,843,517us-gaap_BillingsInExcessOfCost	$ 1,448,563us-gaap_BillingsInExcessOfCost

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

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