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Costs, Estimated Earnings and Billings on Uncompleted Contracts (Tables) | 12 Months Ended
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Jan. 31, 2013
Costs, Estimated Earnings and Billings on Uncompleted Contracts [Abstract] |
Aggregate amounts of costs incurred and earnings accrued on uncompleted contracts compared with billings for contracts |
|  | 2013 |  |  | 2012 |
Costs incurred on uncompleted contracts |  | $ | 259,390,000 |  |  | $ | 106,379,000 |
Estimated accrued earnings |  |  | 48,724,000 |  |  |  | 12,121,000 |
|  |  | 308,114,000 |  |  |  | 118,500,000 |
Less – Billings to date |  |  | 380,295,000 |  |  |  | 183,723,000 |
Billings in excess of costs and estimated earnings on uncompleted contracts, net |  | $ | 72,181,000 |  |  | $ | 65,223,000 |
Costs and estimated earnings in excess of billings |  | $ | 1,178,000 |  |  | $ | 2,781,000 |
Billings in excess of costs and estimated earnings |  |  | 73,359,000 |  |  |  | 68,004,000 |
Billings in excess of costs and estimated earnings on uncompleted contracts, net |  | $ | 72,181,000 |  |  | $ | 65,223,000 |

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