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Costs, Estimated Earnings and Billings on Uncompleted Contracts (Details) (USD $)
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Apr. 30, 2013
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Jan. 31, 2013
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| Aggregate amounts of costs incurred and earnings accrued on uncompleted contracts compared with billings for contracts | ||
| Costs incurred on uncompleted contracts | $ 289,733,000 | $ 259,390,000 |
| Estimated accrued earnings | 59,482,000 | 48,724,000 |
| Contracts Receivables, Gross | 349,215,000 | 308,114,000 |
| Less-Billings to date | 409,638,000 | 380,295,000 |
| Billings in excess of costs and estimated earnings on uncompleted contracts, net | 60,423,000 | 72,181,000 |
| Costs and estimated earnings in excess of billings | 1,062,000 | 1,178,000 |
| Billings in excess of costs and estimated earnings | 61,485,000 | 73,359,000 |
| Billings in excess of costs and estimated earnings on uncompleted contracts, net | $ 60,423,000 | $ 72,181,000 |