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 $)	Jul. 31, 2014	Jan. 31, 2014
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 283,935,000	$ 162,137,000
Estimated accrued earnings	49,187,000	21,961,000
Contracts Receivables, Gross	333,122,000	184,098,000
Less - Billings to date	(514,276,000)	(318,307,000)
Billings in excess of costs and estimated earnings on uncompleted contracts, net	(181,154,000)	(134,209,000)
Costs and estimated earnings in excess of billings	430,000	527,000
Billings in excess of costs and estimated earnings	(181,584,000)	(134,736,000)
Billings in excess of costs and estimated earnings on uncompleted contracts, net	$ (181,154,000)	$ (134,209,000)