CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) shares in Thousands, $ in Thousands	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 37,419	$ 26,685
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Impairment loss	1,979
Stock option compensation expense	1,270	1,057
Depreciation	918	258
Amortization of purchased intangibles	521	164
Other	(213)	(79)
Changes in operating assets and liabilities
Accounts receivable	31,484	(5,774)
Prepaid expenses and other assets	(993)	(1,133)
Accounts payable and accrued expenses	24,029	(4,232)
Billings in excess of costs and estimated earnings, net	16,293	(46,032)
Net cash provided by (used in) operating activities	112,707	(29,086)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(220,000)	(133,000)
Maturities of short-term investments	114,000	16,000
Purchases of property, plant and equipment, net	(1,612)	(2,503)
Purchase of APC, net of cash acquired		(4,210)
Increase in notes receivable		(605)
Net cash used in investing activities	(107,612)	(124,318)
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to joint venture partners	(7,500)
Proceeds from the exercise of stock options	4,217	1,000
Excess income tax benefit on exercised stock options (Note 2)		356
Net cash (used in) provided by financing activities	(3,283)	1,356
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	134	493
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1,946	(151,555)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	160,909	333,691
CASH AND CASH EQUIVALENTS, END OF PERIOD	162,855	182,136
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes	$ 13,939	$ 10,703
Common stock issued in connection with the acquisition of APC (noncash transaction, see Note 3)		3,536