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”) and efficient energy systems (“EES”) 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: AV S.r.l. Italy, Skytower, LLC, AeroVironment GmbH, AeroVironment Massachusetts, LLC, AeroVironment Rhode Island, LLC, Skytower Inc., AILC, Inc., AeroVironment International PTE. LTD. and Regenerative Fuel Cell Systems, LLC, Charger Bicycles, LLC and AeroVironment, Inc. (Afghanistan) (collectively referred to herein as the “Company”). 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. 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. Segments The Company’s products are sold and divided among two reportable segments to reflect the Company’s strategic goals. 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 is the Chief Executive Officer, who reviews the revenue and gross margin results for each of these segments in order to make resource allocation decisions, including the focus of research and development (“R&D”), activities, and assessing performance. The Company’s reportable segments are business units that offer different products and services and are managed separately. 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 and estimates of anticipated contract costs and revenue utilized in the revenue recognition process. Actual results could differ from those estimates. Out-of-Period Adjustments During the fiscal year ended April 30, 2016, the Company identified the following errors: 1) other current liabilities and the related cost of sales, selling, general and administrative and research and development expenses were understated due to state use taxes owed for certain internally consumed tangible assets not identified on a timely basis; and 2) property and equipment, net, were understated, capital lease obligations were understated, operating cash flows were understated, and investing cash flows were overstated due to certain IT equipment and perpetual software license capital lease agreements being incorrectly classified as operating leases. The Company assessed the materiality of these errors considering the relevant quantitative and qualitative factors and concluded that the errors were not material to the consolidated financial statements taken as a whole. As such, during the three months ended January 30, 2016, the Company recorded the following out-of-period adjustments to correct the errors: 1) increased “other current liabilities” $747,000 , increased “research and development” expense $503,000 , increased “selling, general and administrative” expense $155,000 , and increased cost of sales $89,000 ; and 2) increased “property and equipment, net”, $584,000 , increased “Capital lease obligations – net of current portion” $319,000 , and increased capital lease obligations – current portion $324,000 which is included in “Other current liabilities”. In addition, $220,000 of cash outflows were reclassified from operating activities to “Principal payments on capital lease agreements” within financing activities. The consolidated statements of operations and consolidated statements of comprehensive income (loss) for the fiscal year ended April 30, 2016, the consolidated balance sheet as of April 30, 2016 and the consolidated statement of cash flows for the fiscal year ended April 30, 2016 reflect the above adjustments. Reclassifications Certain prior year amounts have been reclassified to conform to the current year presentation. 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. The convertible bond in which the Company had invested, which was classified as available-for-sale, contained an embedded conversion feature which was bifurcated from the bond. The change in the fair value of the embedded conversion feature was recorded in other income in the income statement. 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 and accounts receivable. The Company currently invests the majority of its cash in municipal bonds and U.S. government securities. The Company’s revenue and accounts receivable are with a limited number of corporations and governmental entities. In the aggregate, 71% , 80% and 75% of the Company’s revenue came from agencies of the U.S. government for the years ended April 30, 2016, 2015 and 2014, respectively. These agencies accounted for 39% and 29% of the accounts receivable balances at April 30, 2016 and 2015, respectively. One such agency, the U.S. Army, accounted for 27% , 47% and 45% of the Company’s consolidated revenue for the years ended April 30, 2016, 2015 and 2014, respectively. The U.S. Army accounted for approximately 31% , 55% and 54% of UAS reportable segment sales for the years ended April 30, 2016, 2015 and 2014, 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, 2016 and 2015, the retention balances were $1,453,000 and $1,344,000 , 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 market 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 market 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. 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, 2016 and 2015, the Company accrued sales commissions in other current liabilities of $3,287,000 and $837,000 , 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, 2016 and 2015, the Company estimated and recorded a self insurance liability in wages and related accruals of approximately $1,176,000 and $1,293,000 , 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. 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, a target payout is 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 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 $53,546,000 , $36,998,000 and $28,393,000 for the years ended April 30, 2016, 2015 and 2014, respectively. The related cost of sales for customer ‑funded research and development totaled approximately $34,786,000 , $24,776,000 and $18,644,000 for the years ended April 30, 2016, 2015 and 2014, 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 $1,714,000 and $1,381,000 as of April 30, 2016 and 2015, respectively. Advertising Costs Advertising costs are expensed as incurred. Advertising expenses included in SG&A expenses were approximately $486,000 , $416,000 and $225,000 for the years ended April 30, 2016, 2015 and 2014, 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, 2016 2015 2014 Numerator for basic earnings per share: Net income $ $ $ Denominator for basic earnings per share: Weighted average common shares Dilutive effect of employee stock options, restricted stock and restricted stock units Denominator for diluted earnings per share During the years ended April 30, 2016, 2015 and 2014, certain options, shares of restricted stock and restricted stock units were not included in the computation of diluted earnings per share because their inclusion would have been anti ‑dilutive. The number of options, restricted stock and restricted stock units which met this anti ‑dilutive criterion was approximately 22,000 , 43,000 and 51,000 for the years ended April 30, 2016, 2015 and 2014, respectively. Recently Issued Accounting Standards In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014 ‑09, Revenue from Contracts with Customers (Topic 606) . The new revenue recognition standard provides a five ‑step analysis of transactions to determine when and how revenue is recognized. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU is effective for annual periods beginning after December 15, 2017 and shall be applied either retrospectively to each period presented or as a cumulative ‑effect adjustment as of the date of adoption. The Company is evaluating the potential impact of this adoption on its consolidated financial statements. In 2016, the FASB issued ASUs containing implementation guidance related to ASU 2014-09, including: ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), which is intended to improve the operability and understandability of the implementation guidance on principal versus agent considerations; ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing , which is intended to clarify two aspects of Topic 606: identifying performance obligations and the licensing implementation guidance ; and ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients , which contains certain provision and practical expedients in response to identified implementation issues. The Company is evaluating the potential impact of this adoption on its consolidated financial statements. In April 2015, the FASB issued ASU No. 2015 ‑05, Intangibles—Goodwill and Other—Internal ‑Use Software (Subtopic 350 ‑40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. This ASU adds explicit guidance into U.S. GAAP regarding a customer’s accounting for fees paid in a cloud computing arrangement. The ASU provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. This update is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. A reporting entity should apply the amendments either (1) prospectively to all arrangements entered into or materially modified after the effective date or (2) retrospectively. The Company is evaluating the potential impact of this adoption on its consolidated financial statements. In July 2015, the FASB issued ASU No. 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory . This ASU does not apply to inventory that is measured using last-in, first-out (LIFO) or the retail inventory method. The amendments apply to all other inventory, which includes inventory that is measured using first-in, first-out (FIFO) or average cost. This ASU eliminates from U.S. GAAP the requirement to measure inventory at the lower of cost or market. Market under the previous requirement could be replacement cost, net realizable value, or net realizable value less an approximately normal profit margin. Entities within the scope of this update will now be required to measure inventory at the lower of cost and net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. Subsequent measurement is unchanged for inventory using LIFO or the retail inventory method. The amendments in this update are effective for fiscal years beginning after December 15, 2016, with early adoption permitted. The Company is evaluating the potential impact of this adoption on its consolidated financial statements. In July 2015, the FASB issued ASU No. 2015-17, Income Taxes (Topic 740) - Balance Sheet Classification of Deferred Taxes . This update simplifies the presentation of deferred income taxes, by requiring that deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The current requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount is not affected by the amendments in this update. This update is effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company is evaluating the potential impact of adoption on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This ASU requires the lessee to recognize the assets and liabilities for the rights and obligations created by leases with terms of 12 months or more. The guidance is effective for fiscal years beginning after December 15, 2018 and interim periods therein, with early adoption permitted. The Company is evaluating the potential impact of this adoption on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting , which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, accounting for forfeitures, and classification on the statement of cash flows. ASU 2016-09 will be effective for interim and annual reporting periods beginning after |