Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 16,821,000	$ 20,863,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gains on the deconsolidation of variable interest entities	0	(2,444,000)
Deferred income tax (benefit) expense	(125,000)	1,214,000
Stock option compensation expense	968,000	759,000
Depreciation	283,000	265,000
Amortization of purchased intangibles	121,000	121,000
Changes in operating assets and liabilities
Accounts receivable, net	(10,766,000)	9,880,000
Costs and estimated earnings in excess of billings	97,000	740,000
Prepaid expenses and other assets	(1,098,000)	(2,194,000)
Accounts payable and accrued expenses	18,037,000	(15,331,000)
Billings in excess of costs and estimated earnings	46,848,000	(33,284,000)
Net cash provided by (used in) operating activities	71,186,000	(19,411,000)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(199,000)	(851,000)
Net cash used in investing activities	(199,000)	(851,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from the exercise of stock options	2,282,000	149,000
Increase in notes receivable	(320,000)	(1,713,000)
Deconsolidation of the cash of variable interest entities	0	(399,000)
Net cash provided by (used in) financing activities	1,962,000	(1,963,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	72,949,000	(22,225,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	272,209,000	175,142,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	345,158,000	152,917,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes	$ 5,153,000	$ 9,385,000