| Description of Business and Summary of Significant Accounting Policies | Note 1. Description of Business and Summary of Significant Accounting Policies Description of Business Lumentum (we, us, our or the Company) is an industry leading provider of optical and photonic products defined by revenue and market share addressing a range of end market applications including Datacom and Telecom networking and commercial lasers for manufacturing, inspection and life-science applications. We are using our core optical and photonic technology and our volume manufacturing capability to expand into attractive emerging markets that benefit from advantages that optical or photonics-based solutions provide, including 3D sensing for consumer electronics and diode light sources for a variety of consumer and industrial applications. The majority of our customers tend to be OEMs that incorporate our products into their products which then address end-market applications. For example, we sell fiber optic components that our NEM customers assemble into communications networking systems, which they sell to network service providers or enterprises with their own networks. Similarly, many of our customers for our Lasers products incorporate our products into tools they produce, which are used for manufacturing processes by their customers. Basis of Presentation On July 31, 2015, prior to the Separation, Viavi transferred substantially all of the assets and liabilities and operations of the CCOP segment and WaveReady product lines to Lumentum. Financial statements for periods prior to the Separation were prepared on a stand-alone basis and were derived from Viavi’s consolidated financial statements and accounting records. The Company prepared consolidated financial statements for the period from June 28, 2015 to August 1, 2015 where expenses were allocated to us using estimates that we consider to be a reasonable reflection of the utilization of services provided to, or benefits received by, us. From August 1, 2015 to July 2, 2016, the Company prepared consolidated financial statements as an independent stand-alone basis pursuant to the rules and regulations of the SEC and are in conformity with U.S. GAAP. In the opinion of management, these consolidated financial statements reflect all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair statement of the consolidated financial statements for the periods shown. The results of operations for such periods are not necessarily indicative of the results expected for the full year or for any future periods. On August 1, 2015, Lumentum became an independent publicly-traded company through the distribution by JDS Uniphase (“JDSU”) to its stockholders of 80.1% of our outstanding common stock (the “Separation”). Each JDSU stockholder of record as of the close of business on July 27, 2015 received one share of Lumentum common stock for every five shares of JDSU common stock held on the record date. JDSU was renamed Viavi and at the time of the distribution retained ownership of 19.9% of Lumentum’s outstanding shares. Lumentum was incorporated in Delaware as a wholly owned subsidiary of Viavi on February 10, 2015 and is comprised of the former communications and commercial optical products (“CCOP”) segment and WaveReady product lines of Viavi. Lumentum’s Registration Statement on Form 10 was declared effective by the SEC on July 16, 2015. Lumentum’s common stock began trading “regular-way” under the ticker “LITE” on the NASDAQ stock market on August 4, 2015. The preparation of the consolidated financial statements in accordance with GAAP in the United States requires management to make estimates and assumptions that affect the amounts reported in our consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and various other assumptions believed to be reasonable. Although these estimates are based on management’s best knowledge of current events and actions that may impact the Company in the future, actual results may be different from the estimates. Our critical accounting policies are those that affect our financial statements materially and involve difficult, subjective or complex judgments by management. Those policies are revenue recognition, inventory valuation, allocation methods and allocated expenses from Viavi, valuation of goodwill and other intangible assets, valuation of derivative liabilities, stock-based compensation, retirement and post-retirement plan assumptions, restructuring, warranty and accounting for income taxes. See “ Note 3. Related Party Transactions ” in the Notes to Consolidated Financial Statements regarding the relationships we had with Viavi. Fiscal Years We utilize a 52-53 week fiscal year ending on the Saturday closest to June 30th. Our fiscal 2017 ended on July 1, 2017 and was a 52-week year. Our fiscal 2016 ended on July 2, 2016 and was a 53-week year. Our fiscal 2015 ended on June 27, 2015 and was a 52-week year. Principles of Consolidation These audited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intra-company transactions within our business were eliminated. All material transactions between us and other businesses of Viavi prior to Separation were reflected as net transfers to and from Viavi as a component of financing activities in the consolidated statements of cash flows. Accounting Policies Fair Value of Financial Instruments We define fair value as the price that would be received from selling an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities which are required to be recorded at fair value, we consider the principal or most advantageous market in which to transact and the market-based risk. We apply fair value accounting for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. The carrying amounts reported in the consolidated financial statements approximate the fair value for cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities due to their short-term nature. Cash and Cash Equivalents We consider highly-liquid fixed income securities with original maturities of three months or less at the time of purchase to be cash equivalents. As of fiscal year ended July 1, 2017 , cash and cash equivalents consist of certificates of deposit, commercial papers, and money market funds. As of fiscal year ended July 2, 2016 , our cash and cash equivalents did not include any investments with original maturities of three months or less. Short-term Investments We classify our investments in debt as available-for-sale and record these investments at fair value. Investments with an original maturity of three months or less at the date of purchase are considered cash equivalents, while all other investments are classified as short-term based on management’s intent and ability to use the funds in current operations. Unrealized gains and losses are reported as a component of other comprehensive loss. Realized gains and losses are determined based on the specific identification method, and are reflected as interest and other income (expense), net in our Consolidated Statements of Operations. We regularly review our investment portfolio to identify and evaluate investments that have indicators of possible impairment. Factors considered in determining whether a loss is other-than-temporary include, but are not limited to: the length of time and extent a security’s fair value has been below its cost, the financial condition and near-term prospects of the investee, the credit quality of the security’s issuer, likelihood of recovery and our intent and ability to hold the security for a period of time sufficient to allow for any anticipated recovery in value. For our debt instruments, we also evaluate whether we have the intent to sell the security or it is more likely than not that we will be required to sell the security before recovery of its cost basis. Impairment of Marketable and Non-Marketable Securities We periodically review our marketable and non-marketable securities for impairment. If we conclude that any of these investments are impaired, we determine whether such impairment is other-than-temporary. We consider factors such as the duration, severity and the reason for the decline in value, the potential recovery period and whether we intend to sell. For marketable debt securities, we also consider whether (i) it is more likely than not that we will be required to sell the debt securities before recovery of their amortized cost basis, and (ii) the amortized cost basis cannot be recovered as a result of credit losses. If any impairment is considered other-than-temporary, we will write-down the security to its fair value. Basic and Diluted Net Loss per Common Share Basic income (loss) per share is computed by dividing net income (loss) available to common shareholders by the weighted average number of common shares outstanding during the reporting period. The weighted average number of shares is calculated by taking the number of shares outstanding and weighting them by the amount of time that they were outstanding. Diluted earnings per share reflects the potential dilution that could occur if stock options, preferred stock, and other commitments to issue common stock were exercised or equity awards vest resulting in the issuance of common stock that could share in the earnings of the Company. Diluted loss per share is the same as basic loss per share during periods where net losses are incurred since the inclusion of the potential common stock equivalents would be anti-dilutive as a result of the net loss. Inventory Valuation Inventory is valued at standard cost, which approximates actual cost computed on a first-in, first-out basis, not in excess of net realizable value. We assess the value of our inventory on a quarterly basis and write down those inventories which are obsolete or in excess of our forecasted usage to their estimated realizable value. Our estimates of realizable value are based upon our analysis and assumptions including, but not limited to, forecasted sales levels by product, expected product lifecycle, product development plans and future demand requirements. Our product line management personnel play a key role in our excess review process by providing updated sales forecasts, managing product transitions and working with manufacturing to minimize excess inventory. If actual market conditions are less favorable than our forecasts or actual demand from our customers is lower than our estimates, we may be required to record additional inventory write-downs. If actual market conditions are more favorable than anticipated, inventory previously written down may be sold, resulting in lower cost of sales and higher income from operations than expected in that period. Property, Plant and Equipment Property, plant and equipment are stated at cost. Depreciation is computed by the straight-line method generally over the following estimated useful lives of the assets: 10 to 50 years for building and improvements, 3 to 5 years for machinery and equipment, and 2 to 5 years for furniture, fixtures, software and office equipment. Leasehold improvements are amortized using the straight-line method over the shorter of the estimated useful lives of the assets or the term of the lease. Goodwill Goodwill represents the excess of the purchase price of an acquired business over the fair value of the identifiable assets acquired and liabilities assumed. We test for impairment of goodwill on an annual basis in the fourth quarter and at any other time when events occur or circumstances indicate that the carrying amount of goodwill may not be recoverable. Refer to “Note 13. Goodwill and Other Intangible Assets” in the Notes to Consolidated Financial Statements. An entity has the option to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. If an entity determines that as a result of the qualitative assessment that it is more likely than not (i.e., greater than 50% likelihood) that the fair value of a reporting unit is less than its carrying amount, then the quantitative test is required. Otherwise, no further testing is required. The two-step quantitative goodwill impairment test requires us to estimate the fair value of our reporting units. If the carrying value of a reporting unit exceeds its fair value, the goodwill of that reporting unit is potentially impaired and we proceed to step two of the impairment analysis. In step two of the analysis, we measure and record an impairment loss equal to the excess of the carrying value of the reporting unit’s goodwill over its implied fair value, if any. Application of the goodwill impairment test requires judgments, including: identification of the reporting units, assigning assets and liabilities to reporting units, assigning goodwill to reporting units, a qualitative assessment to determine whether there are any impairment indicators, and determining the fair value of each reporting unit. We estimate the fair value of a reporting unit using the market approach, which estimates the fair value based on comparable market prices. Significant estimates in the market approach include: identifying similar companies with comparable business factors such as size, growth, profitability, risk and return on investment, and assessing comparable revenue and operating income multiples in estimating the fair value of the reporting unit. We base our estimates on historical experience and on various assumptions about the future that we believe are reasonable based on available information. Unanticipated events and circumstances may occur that affect the accuracy of our assumptions, estimates and judgments. For example, if the price of our common stock were to significantly decrease combined with other adverse changes in market conditions, thus indicating that the underlying fair value of our reporting units may have decreased, we might be required to reassess the value of our goodwill in the period such circumstances were identified. Intangible Assets Intangible assets consist primarily of intangible assets purchased through acquisitions. Purchased intangible assets primarily include acquired developed technologies (developed and core technology). Intangible assets are amortized using the straight-line method over the estimated economic useful lives of the assets, which is the period during which expected cash flows support the fair value of such intangible assets. Long-lived Asset Valuation (Property, Plant and Equipment and Intangible Assets Subject to Amortization) We test long-lived assets for recoverability, at the asset group level, when events or changes in circumstances indicate that their carrying amount may not be recoverable. Circumstances which could trigger a review include, but are not limited to: significant decreases in the market price of the asset, significant adverse changes in the business climate or legal factors, accumulation of costs significantly in excess of the amount originally expected for the acquisition or construction of the asset, current period cash flow or operating losses combined with a history of losses or a forecast of continuing losses associated with the use of the asset, or current expectation that the asset will more likely than not be sold or disposed significantly before the end of its estimated useful life. Recoverability is assessed based on the difference between the carrying amount of the asset and the sum of the undiscounted cash flows expected to result from the use and the eventual disposal of the asset. An impairment loss is recognized when the carrying amount is not recoverable and exceeds fair value. Pension Benefits The funded status of our retirement-related benefit plan is measured as the difference between the fair value of plan assets and the benefit obligation at fiscal year end, the measurement date. The funded status of an underfunded benefit plan, of which the fair value of plan assets is less than the benefit obligation, is recognized as a non-current net pension liability in the consolidated balance sheets unless the fair value of plan assets is not sufficient to cover the expected payments to be made over the next year (or operating cycle, if longer) from the measurement date. For defined benefit pension plans, the benefit obligation is the projected benefit obligation (“PBO”) which represents the actuarial present value of benefits expected to be paid upon retirement. Net periodic pension cost (income) (“NPPC”) is recorded in the consolidated statements of operations and includes service cost, interest cost, expected return on plan assets, amortization of prior service cost and (gains) losses previously recognized as a component of accumulated other comprehensive income. Service cost represents the actuarial present value of participant benefits attributed to services rendered by employees in the current year. Interest cost represents the time value of money cost associated with the passage of time. (Gains) losses arise as a result of differences between actual experience and assumptions or as a result of changes in actuarial assumptions. Prior service cost (credit) represents the cost of benefit improvements attributable to prior service granted in plan amendments. (Gains) losses and prior service cost (credit) that arise during the current year are first recognized as a component of accumulated other comprehensive income in the consolidated balances sheets, net of tax. Prior service cost is amortized as a component of NPPC over the average remaining service period of active plan participants starting at the date the plan amendment is adopted. Deferred actuarial (gains) losses are subsequently recognized as a component of NPPC if they exceed the greater of ten percent of PBO or the fair value of plan assets, with the excess amortized over the average remaining service period of active plan participants. The measurement of the benefit obligation and NPPC is based on our estimates and actuarial valuations, provided by third-party actuaries, which are approved by management. These valuations reflect the terms of the plans and use participant-specific information such as compensation, age and years of service, as well as certain assumptions, including estimates of discount rates, expected return on plan assets, rate of compensation increases, and mortality rates. We evaluate these assumptions annually at a minimum. In estimating the expected return on plan assets, we consider historical returns on plan assets, adjusted for forward-looking considerations, inflation assumptions and the impact of the active management of the plan’s invested assets. Concentration of Credit and Other Risks Financial instruments that potentially subject our business to concentration of credit risk consist primarily of cash and cash equivalents and trade receivables. We perform credit evaluations of our customers’ financial condition and generally do not require collateral from our customers. These evaluations require significant judgment and are based on a variety of factors including, but not limited to, current economic trends, payment history, bad debt write-off experience, and financial review of the customer. Although the Company deposits its cash with financial institutions that management believes are of high credit quality, its deposits, at times, may exceed federally insured limits. The Company’s investment portfolio consists of investment grade securities diversified amongst security types, industries, and issuers. The Company’s investment policy limits the amount of credit exposure in the investment portfolio to a maximum of 5% to any one issuer, except for Treasury and Government Agencies securities, and the Company believes no significant concentration risk exists with respect to these investments. We maintain an allowance for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. When we become aware that a specific customer is unable to meet their financial obligations, we record a specific allowance to reflect the level of credit risk in the customer’s outstanding receivable balance. In addition, we record additional allowances based on certain percentages of aged receivable balances. These percentages take into account a variety of factors including, but not limited to, current economic trends, payment history and bad debt write-off experience. We classify bad debt expenses as selling, general and administrative (“SG&A”) expense. We have significant trade receivables concentrated in the telecommunications industry. While our allowance for doubtful accounts balance is based on historical loss experience along with anticipated economic trends, unanticipated financial instability in the telecommunications industry could lead to higher than anticipated losses. During fiscal 2017 , 2016 and 2015 , several customers generated more than 10% of total net revenue. Refer to “ Note 19. Operating Segments and Geographic Information ” in the Notes to Consolidated Financial Statements. As of July 1, 2017 and July 2, 2016, one unique customer represented greater than 10% of total accounts receivable, net for each period. We rely on a limited number of suppliers for a number of key components contained in our products. We also rely on a limited number of significant independent contract manufacturers for the production of certain key components and subassemblies contained in our products. We generally use a rolling twelve month forecast based on anticipated product orders, customer forecasts, product order history and backlog to determine our materials requirements. Lead times for the parts and components that we order vary significantly and depend on factors such as the specific supplier, contract terms and demand for a component at a given time. If the forecast does not meet or if it exceeds actual demand, we may have excess or shortfalls of some materials and components, as well as excess inventory purchase commitments. We could experience reduced or delayed product shipments or incur additional inventory write-downs and cancellation charges or penalties, which would increase costs and could have a material adverse impact on our results of operations. Foreign Currency Translation Assets and liabilities of non-U.S. subsidiaries that operate in a local currency environment, where that local currency is the functional currency, are translated into U.S. dollars at exchange rates in effect at the balance sheet date, with the resulting translation adjustments directly recorded to a separate component of accumulated other comprehensive income, within the consolidated statements of redeemable convertible preferred stock, stockholders equity, and invested equity. Income and expense accounts are translated at the average exchange rates during the year. Gains and losses from re-measurement of monetary assets and liabilities denominated in currencies other than the respective functional currencies are included in the consolidated statements of operations as a component of interest and other income (expense), net. Net gains or (losses) resulting from foreign currency transactions, including hedging gains and losses that were previously allocated to us by Viavi, are reported in interest and other income (expense), net and was $0.6 million , $(0.9) million and $(0.3) million during fiscal 2017 , 2016 and 2015 , respectively. Revenue Recognition We recognize revenue when all four revenue recognition criteria have been met: (i) persuasive evidence of an arrangement exists, (ii) the product has been delivered or the service has been rendered, (iii) the price is fixed or determinable and (iv) collection is reasonably assured. Revenue from product sales is recorded when all of the foregoing conditions are met and risk of loss and title passes to the customer. Our products typically include a warranty and the estimated cost of product warranty claims, based on historical experience, is recorded at the time the sale is recognized. Sales to customers are generally not subject to price protection or return rights. The majority of our sales are made to OEMs, distributors, resellers and end-users. Stock-based Compensation Compensation expense related to stock-based transactions, including employee and director restricted stock units (“RSUs”) is measured and recognized in the financial statements based on fair value at the grant date. The fair value of time-based RSUs is based on the closing market price of our common stock on the grant date of the award. The stock-based compensation expense is recognized, net of forfeitures using a straight-line basis over the requisite service periods of the awards, which is generally three to four years. We estimate the expected forfeiture rate and recognize only expense for those shares expected to vest. When estimating forfeitures, we consider historical forfeiture experiences as well as our expectation about future terminations and workforce reduction programs. The estimated forfeiture rate is trued up to the actual forfeiture rate as the equity awards vest. The total fair value of the equity awards, net of forfeitures, is recorded on a straight-line basis over the requisite service periods of the awards, which is generally the vesting period, except for performance stock units which are amortized on a graded vesting method. We estimate the fair value of the rights to acquire stock under our Employee Stock Purchase Plan (“ESPP”) using the Black-Scholes option pricing formula. Our ESPP provides for consecutive six-month offering periods. We recognize such compensation expense on a straight-line basis over the requisite service period. We calculate the volatility factor based on our historical stock prices. We account for the fair value of RSUs using the closing market price of our common stock on the date of grant. For new-hire grants, RSUs generally vest ratably on an annual basis over four years. For annual refresh grants, RSUs generally vest ratably on an annual, or combination of annual and quarterly, basis over three years. We account for the fair value of performance stock units (“PSUs”) using the closing market price of our common stock on the date of grant. We begin recognizing compensation expense when we conclude that it is probable that the performance conditions will be achieved. We reassess the probability of vesting at each reporting period and adjust our compensation cost based on this probability assessment. Income Taxes In accordance with the authoritative guidance on accounting for income taxes, we recognize income taxes using an asset and liability approach. This approach requires the recognition of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our consolidated financial statements or tax returns. The measurement of current and deferred taxes is based on provisions of the enacted tax law, and the effects of future changes in tax laws or rates are not anticipated. The authoritative guidance provides for recognition of deferred tax assets if the realization of such deferred tax assets is more likely than not to occur based on an evaluation of both positive and negative evidence and the relative weight of the evidence. With the exception of certain international jurisdictions, we have determined that at this time it is more likely than not that our deferred tax assets will not be realized in the future. This determination is primarily due to our history of losses which impacts our ability to benefit from our deferred tax assets. Accordingly, we have established a valuation allowance for such deferred tax assets. If there is a change in our ability to realize our deferred tax assets for which a valuation allowance has been established, then our tax provision may decrease in the period in which we determine that realization is more likely than not. We are subject to income tax audits by the respective tax authorities of the jurisdictions in which we operate. The determination of our income tax liabilities in each of these jurisdictions requires the interpretation and application of complex, and sometimes uncertain, tax laws and regulations. The authoritative guidance on accounting for income taxes prescribes both recognition and measurement criteria that must be met for the benefit of a tax position to be recognized in the financial statements. If a tax position taken, or expected to be taken, in a tax return does not meet such recognition or measurement criteria, an unrecognized tax benefit liability is recorded. If we ultimately determine that an unrecognized tax benefit liability is no longer necessary, we reverse the liability and recognize a tax benefit in the period in which it is determined that the unrecognized tax benefit liability is no longer necessary. The recognition and measurement of current taxes payable or refundable and deferred tax assets and liabilities requires that we make certain estimates and judgments. Changes to these estimates or a change in judgment may have a material impact on our tax provision in a future period. Restructuring Accrual Costs associated with restructuring activities are recognized when they are incurred. However, in the case of leases, the expense is estimated and accrued when the property is vacated. Given the significance of, and the timing of the execution of such activities, this process is complex and involves periodic reassessments of estimates made from the time the property was vacated, including evaluating real estate market conditions for expected vacancy periods and sub-lease income. We recognize a liability for post-employment benefits for workforce reductions related to restructuring activities when payment is probable and the amount is reasonably estimable. We continually evaluate the adequacy of the remaining liabilities under our restructuring initiatives. Although we believe that these estimates accurately reflect the costs of our restructuring plans, actual results may differ, thereby requiring us to record additional provisions or reverse a portion of such provisions. Refer to “ Note 14. Restructuring and Related Charges ” in the Notes to Consolidated Financial Statements. Derivative Liabilities The Series A Preferred Stock issued by our subsidiary Lumentum Inc. is redeemable at the option of the holder after five years and classified as non-controlling interest redeemable convertible preferred stock in our consolidated balance sheet and is measured at its redemption value. The Series A Preferred Stock conversion feature is bifurcated from the Series A Preferred Stock and accounted for separately as a derivative liability. In March 2017, we issued $450.0 million in aggregate principal amount of 0.25% Convertible Senior Notes due in March 2024 (the “2024 Notes”), unless earlier repurchased by us or converted pursuant to their terms. We separated the derivative liability from the host debt instrument based on the fair value of the derivative liability. On a quarterly basis, the derivative liabilities are marked to market based on the fair value of the conversion features, with the resulting income or loss recorded as unrealized loss on derivative liabilities on our consolidated statements of operations. The determination of fair value includes various inputs, including volatility and interest rate assumptions. However, the change in the fair value of our common stock has the largest impact to the fair value of the derivatives. Unrealized loss on derivative liabilities amounted to $104.2 million and $0.6 million for the fiscal year ended July 1, 2017 and July 2, 2016, respectively. Business Combinations We allocate the fair value of purchase consideration to the tangible assets acquired, liabilities assumed and intangible assets acquired based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. When determining the fair values of assets acquired and liabilities assumed, management makes significant estimates and assumptions, especially with respect to intangible assets. Critical estimates in valuing certain intangible assets |
