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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 $) | Jan. 31, 2014 | Jan. 31, 2013
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Contractors [Abstract] |  |
Costs incurred on uncompleted contracts | $ 162,137,000 | $ 259,390,000
Estimated accrued earnings | 21,961,000 | 48,724,000
Contracts Receivables, Gross | 184,098,000 | 308,114,000
Less-Billings to date | 318,307,000 | 380,295,000
Billings in excess of costs and estimated earnings on uncompleted contracts, net | 134,209,000 | 72,181,000
Costs and estimated earnings in excess of billings | 527,000 | 1,178,000
Billings in excess of costs and estimated earnings | $ 134,736,000 | $ 73,359,000

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