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Costs, Estimated Earnings and Billings on Uncompleted Contracts - Aggregate Amounts of Costs Incurred and Earnings Accrued on Uncompleted Contracts Compared with Billings for Contracts (Detail) (USD $)
Apr. 30, 2014
Jan. 31, 2014
Contractors [Abstract]    
Costs incurred on uncompleted contracts $ 205,845,000 $ 162,137,000
Estimated accrued earnings 30,387,000 21,961,000
Contracts Receivables, Gross 236,232,000 184,098,000
Less-Billings to date 413,549,000 318,307,000
Billings in excess of costs and estimated earnings on uncompleted contracts, net 177,317,000 134,209,000
Costs and estimated earnings in excess of billings 200,000 527,000
Billings in excess of costs and estimated earnings 177,517,000 134,736,000
Billings in excess of costs and estimated earnings on uncompleted contracts, net $ 177,317,000 $ 134,209,000