CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2018	Apr. 30, 2017
Current assets:
Cash and cash equivalents	$ 143,517	$ 79,904
Short-term investments	113,649	119,971
Accounts receivable, net of allowance for doubtful accounts of $1,080 at April 30, 2018 and $104 at April 30, 2017	56,813	68,719
Unbilled receivables and retentions (inclusive of related party unbilled receivables of $3,145 at April 30, 2018)	13,076	14,120
Inventories, net	38,640	40,908
Prepaid expenses and other current assets	5,103	5,533
Current assets of discontinued operations	28,349	24,930
Total current assets	399,147	354,085
Long-term investments	40,656	42,096
Property and equipment, net	19,219	15,962
Deferred income taxes	11,168	15,089
Other assets	2,721	2,010
Long-term assets of discontinued operations		3,258
Total assets	472,911	432,500
Current liabilities:
Accounts payable	21,340	15,896
Wages and related accruals	16,851	10,947
Income taxes payable	4,085	1,418
Customer advances	2,145	2,057
Other current liabilities	6,892	8,444
Current liabilities of discontinued operations	9,184	9,301
Total current liabilities	60,497	48,063
Deferred rent	1,536	1,719
Capital lease obligations - net of current portion		161
Other non-current liabilities	622	184
Deferred tax liability	67	116
Liability for uncertain tax positions	49	64
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.0001 par value: Authorized shares—10,000,000; none issued or outstanding at April 30, 2018 and April 30, 2017
Common stock, $0.0001 par value: Authorized shares—100,000,000 Issued and outstanding shares—23,908,736 shares at April 30, 2018 and 23,630,419 at April 30, 2017	2	2
Additional paid-in capital	170,139	162,150
Accumulated other comprehensive loss	(21)	(127)
Retained earnings	239,997	219,929
Total AeroVironment stockholders' equity	410,117	381,954
Noncontrolling interest	23	239
Total equity	410,140	382,193
Total liabilities and stockholders' equity	$ 472,911	$ 432,500

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).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
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.