CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 191,430	$ 160,909
Short-term investments	128,225	114,098
Accounts receivable, net	70,903	64,185
Costs and estimated earnings in excess of billings	4,077	4,078
Deferred income taxes	1,018	1,111
Prepaid expenses and other current assets	5,481	7,342
TOTAL CURRENT ASSETS	401,134	351,723
Property, plant and equipment, net	12,184	12,308
Goodwill	36,813	37,405
Intangible assets, net	9,023	9,344
Other assets	112	122
TOTAL ASSETS	459,266	410,902
CURRENT LIABILITIES
Accounts payable	50,804	46,395
Accrued expenses	32,928	35,454
Billings in excess of costs and estimated earnings	134,621	105,863
TOTAL CURRENT LIABILITIES	218,353	187,712
Deferred income taxes	3,139	1,335
TOTAL LIABILITIES	$ 221,492	$ 189,047
COMMITMENTS AND CONTINGENCIES (Notes 10)
STOCKHOLDERS' EQUITY
Preferred stock, par value $0.10 per share - 500 shares authorized; no shares issued and outstanding
Common stock, par value $0.15 per share - 30,000 shares authorized; 14,862 and 14,840 shares issued at April 30 and January 31, 2016, respectively; 14,858 and 14,836 shares outstanding at April 30 and January 31, 2016, respectively	$ 2,229	$ 2,226
Additional paid-in capital	118,425	117,274
Retained earnings	111,811	99,581
Accumulated other comprehensive income (loss)	80	(565)
TOTAL STOCKHOLDERS' EQUITY	232,545	218,516
Noncontrolling interests	5,229	3,339
TOTAL EQUITY	237,774	221,855
TOTAL LIABILITIES AND EQUITY	$ 459,266	$ 410,902