Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 10,851,000	$ 4,800,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities
Deferred income tax (benefit) expense	(129,000)	1,076,000
Stock option compensation expense	520,000	343,000
Depreciation	119,000	142,000
Amortization of purchased intangibles	60,000	60,000
Changes in operating assets and liabilities
Accounts receivable	(7,170,000)	(5,233,000)
Costs and estimated earnings in excess of billings	(140,000)	327,000
Prepaid expenses and other assets	(3,081,000)	(1,846,000)
Accounts payable and accrued expenses	(4,729,000)	(1,914,000)
Billings in excess of costs and estimated earnings	1,409,000	42,781,000
Net cash (used in) provided by operating activities	(2,290,000)	40,536,000
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(56,000,000)
Purchases of property, plant and equipment, net	(1,207,000)	(46,000)
Increase in notes receivable	(386,000)	(320,000)
Net cash used in investing activities	(57,593,000)	(366,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the exercise of stock options	434,000	1,128,000
Excess income tax benefit on exercised stock options	286,000	254,000
Net cash provided by financing activities	720,000	1,382,000
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(59,163,000)	41,552,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	333,691,000	272,209,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	274,528,000	313,761,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes	$ 1,434,000	$ 1,587,000