CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 167,198	$ 160,909
Short-term investments	355,796	114,098
Accounts receivable, net	54,836	64,185
Costs and estimated earnings in excess of billings	3,192	4,078
Prepaid expenses and other current assets	6,927	7,342
TOTAL CURRENT ASSETS	587,949	350,612
Property, plant and equipment, net	13,112	12,308
Goodwill	34,913	37,405
Intangible assets, net	8,181	9,344
Other assets	92	122
TOTAL ASSETS	644,247	409,791
CURRENT LIABILITIES
Accounts payable	101,944	46,395
Accrued expenses	39,539	35,454
Billings in excess of costs and estimated earnings	209,241	105,863
TOTAL CURRENT LIABILITIES	350,724	187,712
Deferred income taxes	954	224
TOTAL LIABILITIES	351,678	187,936
COMMITMENTS AND CONTINGENCIES (Note 11 and 12)
STOCKHOLDERS' EQUITY
Preferred stock, par value $0.10 per share - 500,000 shares authorized; no shares issued and outstanding
Common stock, par value $0.15 per share - 30,000,000 shares authorized; 15,461,452 and 14,839,702 shares issued at January 31, 2017 and 2016, respectively; 15,458,219 and 14,836,469 shares outstanding at January 31,2017 and 2016, respectively	2,319	2,226
Additional paid-in capital	135,426	117,274
Retained earnings	154,649	99,581
Accumulated other comprehensive loss	(762)	(565)
TOTAL STOCKHOLDERS' EQUITY	291,632	218,516
Noncontrolling interests (Note 4)	937	3,339
TOTAL EQUITY	292,569	221,855
TOTAL LIABILITIES AND EQUITY	$ 644,247	$ 409,791

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.