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Costs Estimated Earnings and Billings on Uncompleted Contracts (Tables) | 6 Months Ended
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Jul. 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 | The tables below set forth the aggregate amounts of costs incurred and earnings accrued on uncompleted contracts compared with the billings for those contracts through July 31, 2013 and January 31, 2013, and reconcile the net amounts of billings in excess of costs and estimated earnings to the corresponding amounts included in the condensed consolidated balance sheets at those dates.
|  | July 31, |  |  | January 31, |
|  | 2013 |  |  | 2013 |
Costs incurred on uncompleted contracts |  | $ | 321,895,000 |  |  | $ | 259,390,000 |
Estimated accrued earnings |  |  | 78,940,000 |  |  |  | 48,724,000 |
|  |  | 400,835,000 |  |  |  | 308,114,000 |
Less—Billings to date |  |  | 440,401,000 |  |  |  | 380,295,000 |
|  | $ | 39,566,000 |  |  | $ | 72,181,000 |
Costs and estimated earnings in excess of billings |  | $ | 509,000 |  |  | $ | 1,178,000 |
Billings in excess of costs and estimated earnings |  |  | 40,075,000 |  |  |  | 73,359,000 |
|  | $ | 39,566,000 |  |  | $ | 72,181,000 |

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