Costs, Estimated Earnings and Billings on Uncompleted Contracts (Tables)

3 Months Ended

Apr. 30, 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

	April 30,		January 31,
	2013		2013
Costs incurred on uncompleted contracts	$	289,733,000	$	259,390,000
Estimated accrued earnings		59,482,000		48,724,000
		349,215,000		308,114,000
Less—Billings to date		409,638,000		380,295,000
	$	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
	$	60,423,000	$	72,181,000