Organization and Significant Accounting Policies | 1. Organization and Significant Accounting Policies Organization AeroVironment, Inc., a Delaware corporation, is engaged in the design, development, production, support and operation of unmanned aircraft systems (“UAS”) for various industries and governmental agencies. Significant Accounting Policies Principles of Consolidation The accompanying consolidated financial statements include the accounts of AeroVironment, Inc. and its wholly‑owned subsidiaries: AeroVironment Rhode Island, LLC, Skytower Inc., AeroVironment International PTE. LTD., AeroVironment, Inc. (Afghanistan), as well as the Company’s Turkish joint venture, Altoy Savunma Sanayi ve Havacilik Anonim Sirketi (“Altoy”) (collectively referred to herein as the “Company”). The Company increased its ownership in Altoy to a controlling interest on February 1, 2017. As a result of the increase in ownership, the consolidated financial statements include the balance sheet and results of operations of Altoy from February 1, 2017 forward. Prior to this date, the Company's investment in Altoy was accounted for under the equity method. Refer to Note 19 - Business Acquisitions for further details. All intercompany balances and transactions have been eliminated in consolidation. In April 2016, the Company dissolved AV S.r.l. Italy, AILC, Inc. and AeroVironment Massachusetts, LLC the results of which were not material to the consolidated financial statements. In July 2016, the Company dissolved Charger Bicycles, LLC, the results of which were not material to the consolidated financial statements. In October 2016, the Company dissolved Skytower, LLC and Regenerative Fuel Cell Systems, LLC, the results of which were not material to the consolidated financial statements. In February 2018, the Company dissolved AeroVironment GmbH, the results of which were not material to the consolidated financial statements. On June 1, 2018, the Company entered into an Asset Purchase Agreement (the “Purchase Agreement”) with Webasto Charging Systems, Inc. (“Webasto”) pursuant to which the Company agreed to sell, and Webasto agreed to acquire, substantially all of the assets of the Company’s EES business segment (the “EES Business”) and to assume certain liabilities related to the EES Business. As of April 30, 2018, we determined that the EES Business met the criterion for classification as an asset held for sale and represents a strategic shift in in our operations. Therefore, the assets and liabilities and the results of operations of the EES Business are reported in this Annual Report as discontinued operations for all periods presented. Investments in Companies Accounted for Using the Equity or Cost Method Investments in other non‑consolidated entities are accounted for using the equity method or cost basis depending upon the level of ownership and/or the Company’s ability to exercise significant influence over the operating and financial policies of the investee. When the equity method is used, investments are recorded at original cost and adjusted periodically to recognize the Company’s proportionate share of the investees’ net income or losses after the date of investment. When net losses from an investment accounted for under the equity method exceed its carrying amount, the investment balance is reduced to zero and additional losses are not provided for as the Company is not obligated to provide additional capital. The Company resumes accounting for the investment under the equity method if the entity subsequently reports net income and the Company’s share of that net income exceeds the share of net losses not recognized during the period the equity method was suspended. When an investment accounted for using the equity method issues its own shares, the subsequent reduction in the Company’s proportionate interest in the investee is reflected in equity as an adjustment to paid‑in‑capital. The Company evaluates its investments in companies accounted for by the equity or cost method for impairment when there is evidence or indicators that a decrease in value may be other than temporary. In December of 2017, the Company and Softbank Corp. (“Softbank”) formed a joint venture, HAPSMobile, Inc. (“HAPSMobile”). As the Company has the ability to exercise significant influence over the operating and financial policies of HAPSMobile, the Company’s investment is accounted as an equity method investment. The Company has presented its proportion of HAPSMobile’s net loss in “Equity method investment activity, net of tax” in the consolidated statement of operations. The carrying value of the investment in HAPSMobile was recorded in “Other assets, long-term.” Refer to Note 8 – Equity Method Investments for further details. Segments Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources and in assessing performance. The Company’s CODM, who is the Chief Executive Officer, makes operating decisions, assesses performance and makes resource allocation decisions, including the focus of research and development (“R&D”), on a consolidated basis for the Company’s continuing operations. Accordingly, the Company operates its business as a single reportable segment. Use of Estimates The preparation of consolidated financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Significant estimates made by management include, but are not limited to, valuation of: inventory, available‑for‑sale securities, deferred tax assets and liabilities, useful lives of property, plant and equipment, medical and dental liabilities, warranty liabilities, long-term incentive plan liabilities and estimates of anticipated contract costs and revenue utilized in the revenue recognition process. Actual results could differ from those estimates. Reclassifications Certain prior year amounts have been reclassified to conform to the current year presentation. Equity method losses associated with the Company’s investment in Altoy for the fiscal year ended 2017 and 2016 have been reclassified from other income (expense), net to equity method investment activity, net of tax on the consolidated statement of operations. Cash Equivalents The Company considers all highly liquid investments with an original maturity of three months or less at the time of purchase to be cash equivalents. The Company’s cash equivalents are comprised of money market funds, certificates of deposit of major financial institutions, and U.S. Treasury bills. Investments The Company’s investments are accounted for as held‑to‑maturity and available‑for‑sale and reported at amortized cost and fair value, respectively. Unrealized gains and losses are excluded from earnings and reported as a separate component of stockholders’ equity, net of deferred income taxes for available-for-sale investments. Gains and losses realized on the disposition of investment securities are determined on the specific identification basis and credited or charged to income. Premium and discount on investments are amortized and accreted using the interest method and charged or credited to investment income. Management determines the appropriate classification of securities at the time of purchase and re‑evaluates such designation as of each balance sheet date. Investments are considered to be impaired when a decline in fair value is judged to be other‑than‑temporary. On a quarterly basis, the Company considers available quantitative and qualitative evidence in evaluating potential impairment of its investments. If the cost of an investment exceeds its fair value, the Company evaluates, among other factors, general market conditions, the duration and extent to which the fair value is less than cost, and its intent and ability to hold the investment to maturity. The Company also considers potential adverse conditions related to the financial health of the issuer based on rating agency actions. Once a decline in fair value is determined to be other‑than‑temporary, an impairment charge is recorded in earnings and a new cost basis in the investment is established. Fair Values of Financial Instruments Fair values of cash and cash equivalents, accounts receivable, unbilled receivables, retentions and accounts payable approximate cost due to the short period of time to maturity. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentration of credit risk consist primarily of cash, cash equivalents, municipal bonds, U.S. government securities, U.S. government-guaranteed agency securities, U.S. Government sponsored agency debt securities, highly rated commercial paper, highly rated corporate bonds, and accounts receivable. The Company currently invests the majority of its cash in municipal bonds, U.S. government securities, U.S. government-guaranteed agency securities, U.S. Government sponsored agency debt securities and highly rated corporate bonds. The Company’s revenue and accounts receivable are with a limited number of corporations and governmental entities. In the aggregate, 54%, 63% and 79% of the Company’s revenue came from agencies of the U.S. government for the years ended April 30, 2018, 2017 and 2016, respectively. These agencies accounted for 49% and 45% of the accounts receivable balances at April 30, 2018 and 2017, respectively. One such agency, the U.S. Army, accounted for 19%, 21% and 26% of the Company’s consolidated revenue for the years ended April 30, 2018, 2017 and 2016, respectively. The Company performs ongoing credit evaluations of its commercial customers and maintains an allowance for potential losses. Accounts Receivable, Unbilled Receivables and Retentions Accounts receivable represents primarily U.S. government and Foreign government, and to a lesser extent commercial receivables, net of allowances for doubtful accounts. Unbilled receivables represent costs in excess of billings on incomplete contracts and, where applicable, accrued profit related to government long‑term contracts on which revenue has been recognized, but for which the customer has not yet been billed. Retentions represent amounts withheld by customers until contract completion. At April 30, 2018 and 2017, the retention balances were $1,411,000 and $1,537,000, respectively. The Company determines the allowance for doubtful accounts based on historical customer experience and other currently available evidence. When a specific account is deemed uncollectible, the account is written off against the allowance. The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the accounts receivable balance; such losses have historically been within management’s expectations. An account is deemed past due based on contractual terms rather than on how recently payments have been received. Inventories Inventories are stated at the lower of cost (using the weighted average costing method) or net realizable value. Inventory write‑offs and write‑down provisions are provided to cover risks arising from slow‑moving items or technological obsolescence and for market prices lower than cost. The Company periodically evaluates the quantities on hand relative to current and historical selling prices and historical and projected sales volume. Based on this evaluation, provisions are made to write inventory down to its net realizable value. Long‑Lived Assets Property and equipment are carried at cost. Depreciation of property and equipment, including amortization of leasehold improvements, are provided using the straight‑line method over the following estimated useful lives: Machinery and equipment 2 - 7 years Computer equipment and software 2 - 5 years Furniture and fixtures 3 - 7 years Leasehold improvements Lesser of useful life or term of lease The Company finances the purchase of certain IT equipment and perpetual software licenses with capital lease arrangements. The assets and liabilities under capital leases are recorded at the lesser of the present value of aggregate future minimum lease payments, including estimated bargain purchase options, or the fair value of the asset under lease. Assets under capital leases are depreciated using the straight-line method over the lesser of the estimated useful life of the asset or the term of the lease. Maintenance, repairs and minor renewals are charged directly to expense as incurred. Additions and betterments to property and equipment are capitalized at cost. When the Company disposes of assets, the applicable costs and accumulated depreciation and amortization thereon are removed from the accounts and any resulting gain or loss is included in selling, general and administrative (“SG&A”) expense in the period incurred. The Company reviews the recoverability of its long‑lived assets whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. The estimated future cash flows are based upon, among other things, assumptions about expected future operating performance, and may differ from actual cash flows. If the sum of the projected undiscounted cash flows (excluding interest) is less than the carrying value of the assets, the assets will be written down to the estimated fair value in the period in which the determination is made. There were no events or changes in circumstances that would indicate that the carrying amount of the assets may not be recoverable during the fiscal years ended April 30, 2018, 2017 and 2016. Intangibles Assets — Acquired in Business Combinations The Company performs valuations of assets acquired and liabilities assumed on each acquisition accounted for as a business combination and allocates the purchase price of the acquired business to the respective net tangible and intangible assets. Acquired intangible assets include customer relationships and trade names. The Company determines the appropriate useful life by performing an analysis of expected cash flows based on historical experience of the acquired businesses. Intangible assets are amortized over their estimated useful lives using the straight-line method which approximates the pattern in which the economic benefits are consumed. The Company monitors conditions related to these assets to determine whether events and circumstances warrant a revision to the remaining amortization period. The Company tests its intangible assets with finite lives for potential impairment whenever management concludes events or changes in circumstances indicate that the carrying amount may not be recoverable. The original estimate of an asset's useful life and the impact of an event or circumstance on either an asset's useful life or carrying value involve significant judgment. Product Warranty The Company accrues an estimate of its exposure to warranty claims based upon both current and historical product sales data and warranty costs incurred. Product warranty reserves are recorded in other current liabilities. Accrued Sales Commissions As of April 30, 2018 and 2017, the Company accrued sales commissions in other current liabilities of $1,293,000 and $4,555,000, respectively. Self‑Insurance Liability The Company is self-insured for employee medical claims, subject to individual and aggregate stop loss policies. The Company estimates a liability for claims filed and incurred but not reported based upon recent claims experience and an analysis of the average period of time between the occurrence of a claim and the time it is reported to and paid by the Company. As of April 30, 2018 and 2017, the Company estimated and recorded a self-insurance liability in wages and related accruals of approximately $1,003,000 and $1,133,000, respectively. Income Taxes Deferred income tax assets and liabilities are computed annually for differences between the financial statement and income tax bases of assets and liabilities that will result in taxable or deductible amounts in the future. The provision for income taxes reflects the taxes to be paid for the period and the change during the period in the deferred income tax assets and liabilities. The Company records a valuation allowance to reduce the deferred tax assets to the amount of future tax benefit that is more likely than not to be realized. For uncertain tax positions, the Company determines whether it is “more likely than not” that a tax position will be sustained upon examination by the appropriate taxing authorities before any part of the benefit can be recorded in the financial statements. For those tax positions where it is “not more likely than not” that a tax benefit will be sustained, no tax benefit is recognized. Where applicable, associated interest and penalties are also recorded. On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Tax Act”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017, repeal of the corporate alternative minimum tax, repeal of the deduction for domestic production activities, and limitation on the deductibility of certain executive compensation. In accordance with U.S. GAAP as determined by ASC 740, Income Taxes, the Company is required to record the effects of tax law changes in the period enacted. As the Company has an April 30 fiscal year end, its U.S. federal corporate income tax rate will be blended in fiscal 2018, resulting in a statutory federal rate of approximately 30.4% (eight months at 35% and four months at 21%), and will be 21% for subsequent fiscal years. The Company remeasured its existing deferred tax assets and liabilities at the rate the Company expects to be in effect when those deferred taxes will be realized (30.4% if in 2018 or 21% thereafter) and recorded a one-time deferred tax expense of approximately $3,400,000 during the year ended April 30, 2018. The Company followed the guidance in SEC Staff Accounting Bulletin 118 (“SAB 118”), which provides additional clarification regarding the application of ASC Topic 740 in situations where the Company does not have the necessary information available, prepared, or analyzed in reasonable detail to complete the accounting for certain income tax effects of the Tax Act for the reporting period in which the Act was enacted. SAB 118 provides for a measurement period beginning in the reporting period that includes the Act’s enactment date and ending when the Company has obtained, prepared, and analyzed the information needed in order to complete the accounting requirements but in no circumstances should the measurement period extend beyond one year from the enactment date. The $3,400,000 expense for the one-time deferred tax remeasurement is a provisional estimate of the impact of the Tax Act. In addition, the Company has estimated that it will not have an income tax payable as a result of the one-time deemed repatriation transition tax on unrepatriated foreign earnings. These amounts are considered provisional because they use estimates for which final tax computations or returns have not been completed and because estimated amounts may be impacted by future regulatory and accounting guidance if and when issued. The Company’s financial statements do not reflect the impact of certain aspects of the Tax Act as the Company did not have the necessary information available, prepared, or analyzed (including computations), or because sufficient guidance has not been issued in order to determine an actual or provisional amount for the tax effects of the Act. To date, these aspects include the new compensation related provisions under section 162(m) and the state income tax conformity to the Tax Act. Customer Advances and Amounts in Excess of Cost Incurred The Company receives advances, performance‑based payments and progress payments from customers that may exceed costs incurred on certain contracts, including contracts with agencies of the U.S. government. These advances are classified as advances from customers and will be offset against billings. Revenue Recognition The substantial majority of the Company’s revenue is generated pursuant to written contractual arrangements to design, develop, manufacture and/or modify complex products, and to provide related engineering, technical and other services according to the specifications of the buyers (customers). These contracts may be fixed‑price or cost‑reimbursable. The Company considers all contracts for treatment in accordance with authoritative guidance for contracts with multiple deliverables. Revenue arrangements with multiple deliverables should be divided into separate units of accounting if the deliverables have value to the customer on a stand‑alone basis; there is objective and reliable evidence of the fair value of the undelivered item(s); and, if the arrangement includes a general right of return, delivery or performance of the undelivered item(s) is considered probable and substantially in the control of the vendor. The Company occasionally enters into arrangements that consist of installation and repair contracts associated with hardware sold by the Company. Such arrangements consist of separate contractual arrangements and are divided into separate units of accounting where the delivered item has value to the customer on a stand‑alone basis and there is objective and reasonable evidence of the fair value of the installation contract. Consideration is allocated among the separate units of accounting based on their relative fair values. Product sales revenue is composed of revenue recognized on contracts for the delivery of production hardware and related activities. Contract services revenue is composed of revenue recognized on contracts for the provision of services, including repairs, training, engineering design, development and prototyping activities. Revenue from cost‑plus‑fee contracts are recognized on the basis of costs incurred during the period plus the fee earned. Revenue from fixed‑price contracts are recognized on the percentage‑of‑completion method. Contract costs include all direct material and labor costs and those indirect costs related to contract performance. Unbilled receivables represent costs incurred and related profit on contracts not yet billed to customers, and are invoiced in subsequent periods. Product sales revenue is recognized on the percentage‑of‑completion method or upon transfer of title to the customer, which is generally upon shipment. Shipping and handling costs incurred are included in cost of sales. Revenue and profits on fixed‑price production contracts, where units are produced and delivered in a continuous or sequential process, are recorded as units are delivered based on their selling prices (the “units‑of‑delivery method”). Revenue and profits on other fixed‑price contracts with significant engineering as well as production requirements are recorded based on the ratio of total actual incurred costs to date to the total estimated costs for each contract (the “cost‑to‑cost method”). Accounting for revenue and profits on a fixed‑price contract requires the preparation of estimates of (1) the total contract revenue, (2) the total costs at completion, which is equal to the sum of the actual incurred costs to date on the contract and the estimated costs to complete the contract’s statement of work and (3) the measurement of progress towards completion. The estimated profit or loss at completion on a contract is equal to the difference between the total estimated contract revenue and the total estimated cost at completion. Under the units‑of‑delivery method, sales on a fixed‑price type contract are recorded as the units are delivered during the period based on their contractual selling prices. Under the cost‑to‑cost method, sales on a fixed‑price type contract are recorded at amounts equal to the ratio of actual cumulative costs incurred divided by total estimated costs at completion, multiplied by (i) the total estimated contract revenue, less (ii) the cumulative sales recognized in prior periods. The profit recorded on a contract in any period using either the units‑of‑delivery method or cost‑to‑cost method is equal to (i) the current estimated total profit margin multiplied by the cumulative sales recognized, less (ii) the amount of cumulative profit previously recorded for the contract. In the case of a contract for which the total estimated costs exceed the total estimated revenue, a loss arises, and a provision for the entire loss is recorded in the period that it becomes evident. The unrecoverable costs on a loss contract that are expected to be incurred in future periods are recorded in the program cost. Significant management judgments and estimates must be made and used in connection with the recognition of revenue in any accounting period. Material differences in the amount of revenue in any given period may result if these judgments or estimates prove to be incorrect or if management’s estimates change on the basis of development of the business, market conditions or other factors. Management judgments and estimates have been applied consistently and have been reliable historically. The Company believes that there are two key factors which impact the reliability of management’s estimates. The first of those key factors is that the terms of the Company’s contracts are typically less than six months. The short‑term nature of such contracts reduces the risk that material changes in accounting estimates will occur on the basis of market conditions or other factors. The second key factor is that the Company has hundreds of contracts in any given accounting period, which reduces the risk that any one change in an accounting estimate on one or several contracts would have a material impact on the Company’s consolidated financial statements or its two reporting segments’ measures of profit. Changes in estimates are recognized using the cumulative catch‑up method of accounting. This method recognizes, in the current period, the cumulative effect of the changes on current and prior periods. Stock‑Based Compensation Stock‑based compensation is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which is generally the vesting period of the respective award. No compensation cost is ultimately recognized for awards for which employees do not render the requisite service and are forfeited. Long‑Term Incentive Awards For long‑term incentive awards outstanding as of April 30, 2018, the awards include time-based awards which vest equally over three years and performance-based awards which vest based on the achievement of a target payout established at the beginning of each performance period. The actual payout at the end of the performance period is calculated based upon the Company’s achievement of such targets. Payouts are made in cash and restricted stock units. Upon vesting of the restricted stock units, the Company has the discretion, but not an obligation, to settle the restricted stock units in cash or stock. The cash component of the award is accounted for as a liability. The equity component is accounted for as a stock‑based liability, as the restricted stock units may be settled in cash or stock. At each reporting period, the Company reassesses the probability of achieving the performance targets. The estimation of whether the performance targets will be achieved requires judgment, and, to the extent actual results or updated estimates differ from the Company’s current estimates, the cumulative effect on current and prior periods of those changes will be recorded in the period estimates are revised. Research and Development Internally funded research and development costs (“IRAD”), sponsored by the Company relate to both U.S. government products and services and those for commercial and foreign customers. IRAD costs for the Company are recoverable and allocable under government contracts in accordance with U.S. government procurement regulations. Customer‑funded research and development costs are incurred pursuant to contracts (revenue arrangements) to perform research and development activities according to customer specifications. These costs are direct contract costs and are expensed to cost of sales when the corresponding revenue is recognized, which is generally as the research and development services are performed. Revenue from customer‑funded research and development was approximately $51,848,000, $43,615,000 and $53,546,000 for the years ended April 30, 2018, 2017 and 2016, respectively. The related cost of sales for customer‑funded research and development totaled approximately $36,415,000, $29,790,000 and $34,786,000 for the years ended April 30, 2018, 2017 and 2016, respectively. In January 2017, the Company executed a cost sharing Other Transaction Agreement type contract funded by the US Federal Government to perform certain system design, development and functional testing activities specific to a new prototype UAS on a best-efforts basis. The total estimated costs of the project are approximately $14,200,000, of which the Company is responsible for funding $6,100,000. The remaining $8,100,000 will be reimbursed to the Company as the activities are performed. The term of the agreement is through October 2018. The Company has determined that the contract meets the criteria of ASC 912-730-05 Contractors – Federal Government and, therefore, all reimbursements are recorded as an offset to research and development expense in the consolidated statements of operations. Reimbursements under the contract were $4,188,000 and $233,000 for the fiscal years ended April 30, 2018 and 2017, respectively. Lease Accounting The Company accounts for its leases and subsequent amendments as operating leases or capital leases for financial reporting purposes. Certain operating leases contain rent escalation clauses, which are recorded on a straight‑line basis over the initial term of the lease with the difference between the rent paid and the straight‑line rent recorded as a deferred rent liability. Lease incentives received from landlords are recorded as deferred rent liabilities and are amortized on a straight‑line basis over the lease term as a reduction to rent expense. Deferred rent liabilities were approximately $1,536,000 and $1,719,000 as of April 30, 2018 and 2017, respectively. Advertising Costs Advertising costs are expensed as incurred. Advertising expenses included in SG&A expenses were approximately $526,000, $227,000 and $232,000 for the years ended April 30, 2018, 2017 and 2016, respectively. Foreign Currency Transactions Foreign currency transaction gains and losses are charged or credited to earnings as incurred. For the fiscal years ended April 30, 2018, 2017 and 2016, foreign currency transaction gains and losses that are included in other income (expense) in the accompanying statements of operations were $87,000, $(284,000), and $(63,000), respectively. Earnings Per Share Basic earnings per share are computed using the weighted‑average number of common shares outstanding and excludes any anti‑dilutive effects of options, restricted stock and restricted stock units. The dilutive effect of potential common shares outstanding is included in diluted earnings per share. The reconciliation of diluted to basic shares is as follows: Year Ended April 30, 2018 2017 2016 Numerator for basic and diluted earnings (loss) per share: Continuing operations attributable to AeroVironment $ 22,576,000 $ 16,633,000 $ 15,393,000 Discontinued operations, net of tax (2,508,000) (4,154,000) (6,427,000) Net income attributable to AeroVironment $ 20,068,000 $ 12,479,000 $ 8,966,000 Denominator for basic earnings per share: Weighted average common shares 23,471,241 23,059,045 22,936,413 Dilutive effect of employee stock options, restricted stock and restricted stock units 342,531 248,693 217,080 Denominator for diluted earnings per share 23,813,772 23,307,738 23,153,493 During the years ended April 30, 2018, 2017 and 2016, certain options, shares of restricted stock and restricted stock units were not includ |