CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 122,107	$ 167,198
Short-term investments	311,908	355,796
Accounts receivable, net	94,440	54,836
Costs and estimated earnings in excess of billings	4,887	3,192
Prepaid expenses and other current assets	12,409	6,927
TOTAL CURRENT ASSETS	545,751	587,949
Property, plant and equipment, net	15,299	13,112
Goodwill	34,329	34,913
Other intangible assets, net	7,149	8,181
Deferred taxes	439	241
Other assets	426	92
TOTAL ASSETS	603,393	644,488
CURRENT LIABILITIES
Accounts payable	100,238	101,944
Accrued expenses	35,360	39,539
Billings in excess of costs and estimated earnings	108,388	209,241
TOTAL CURRENT LIABILITIES	243,986	350,724
Deferred taxes	1,279	1,195
TOTAL LIABILITIES	245,265	351,919
COMMITMENTS AND CONTINGENCIES (Notes 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; 15,570,952 and 15,461,452 shares issued at January 31, 2018 and 2017, respectively; 15,567,719 and 15,458,219 shares outstanding at January 31, 2018 and 2017, respectively	2,336	2,319
Additional paid-in capital	143,215	135,426
Retained earnings	211,112	154,649
Accumulated other comprehensive gain (loss)	1,422	(762)
TOTAL STOCKHOLDERS' EQUITY	358,085	291,632
Noncontrolling interests	43	937
TOTAL EQUITY	358,128	292,569
TOTAL LIABILITIES AND EQUITY	$ 603,393	$ 644,488

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.