CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 167,347	$ 167,198
Short-term investments	396,092	355,796
Accounts receivable, net	71,331	54,836
Costs and estimated earnings in excess of billings	4,357	3,192
Prepaid expenses and other current assets	4,544	6,927
TOTAL CURRENT ASSETS	643,671	587,949
Property, plant and equipment, net	14,434	13,112
Goodwill	34,913	34,913
Intangible assets, net	7,998	8,181
Deferred taxes	8,634	8,725
Other assets	276	92
TOTAL ASSETS	709,926	652,972
CURRENT LIABILITIES
Accounts payable	118,077	101,944
Accrued expenses	32,258	39,539
Billings in excess of costs and estimated earnings	234,344	209,241
TOTAL CURRENT LIABILITIES	384,679	350,724
Deferred taxes	9,846	9,679
TOTAL LIABILITIES	394,525	360,403
COMMITMENTS AND CONTINGENCIES (Note 9)
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; 15,488,952 and 15,461,452 shares issued at April 30 and January 31, 2017, respectively; 15,485,719 and 15,458,219 shares outstanding at April 30 and January 31, 2017, respectively	2,323	2,319
Additional paid-in capital	137,401	135,426
Retained earnings	175,274	154,649
Accumulated other comprehensive losses	(658)	(762)
TOTAL STOCKHOLDERS' EQUITY	314,340	291,632
Non-controlling interests	1,061	937
TOTAL EQUITY	315,401	292,569
TOTAL LIABILITIES AND EQUITY	$ 709,926	$ 652,972

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.