CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 14,120	$ 10,851
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Deferred income tax expense (benefit)	1,897	(129)
Stock option compensation expense	659	520
Depreciation	434	119
Amortization of purchased intangibles	321	60
Other	(128)	203
Changes in operating assets and liabilities
Accounts receivable	(6,713)	(7,170)
Prepaid expenses and other assets	(1,408)	(3,424)
Accounts payable and accrued expenses	5,786	(4,729)
Billings in excess of costs and estimated earnings	28,758	1,409
Net cash provided by (used in) operating activities	43,726	(2,290)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(50,000)	(56,000)
Maturities of short-term investments	36,000
Purchases of property, plant and equipment, net	(245)	(1,207)
Increase in notes receivable		(386)
Net cash used in investing activities	(14,245)	(57,593)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the exercise of stock options	414	434
Excess income tax benefit on exercised stock options	81	286
Net cash provided by financing activities	495	720
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	545
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	30,521	(59,163)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	160,909	333,691
CASH AND CASH EQUIVALENTS, END OF PERIOD	191,430	274,528
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for income taxes	$ 847	$ 1,434