Description of Business and Summary of Significant Accounting Policies	6 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	Note 1. Description of Business and Summary of Significant Accounting Policies Description of Business Lumentum Holdings Inc. (“we,” “us,” “our”, “Lumentum” or the “Company”) is an industry-leading provider of optical and photonic products addressing a range of end market applications including Optical Communications (“OpComms”) and Commercial Lasers (“Lasers”) for manufacturing, inspection and life-science applications. We seek to use 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 imaging and sensing for consumer electronics and diode light sources for a variety of consumer and industrial applications. The majority of our customers have historically been, and are currently, original equipment manufacturers (“OEMs”) that incorporate our products into their products which then address end-market applications. For example, we sell fiber optic components that network equipment manufacturers (“NEMs”) assemble into communications networking systems, which they sell to communications service providers, hyperscale cloud operators, and enterprises with their own networks. Similarly, many of our Lasers products customers incorporate our products into tools they produce, which are used for manufacturing processes by their customers. For imaging and sensing, we sell diode lasers to manufacturers of consumer electronics products for mobile, personal computing, gaming, and other applications, including to the automotive industry, who then integrate our devices within their products, for eventual resale to consumers and also into other industrial applications. Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”), which requires management to make estimates and assumptions that affect the amounts reported in our condensed 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 us in the future, actual results may be different from the estimates. Operating results for the quarter ended December 31, 2022 are not necessarily indicative of the results that may be expected for the fiscal year ending July 1, 2023. In the opinion of the Company’s management, the information presented herein reflects all normal and recurring adjustments necessary for a fair presentation of our results of operations, financial position, stockholders’ equity and cash flows. Our critical accounting policies are those that affect our financial statements materially and involve difficult, subjective or complex judgments by management. Those policies are inventory valuation, revenue recognition, income taxes, goodwill and business combinations. Our business and operating results depend significantly on general market and economic conditions. The current global macroeconomic environment is volatile and continues to be significantly and adversely impacted by the COVID-19 pandemic, global supply chain constraints, inflation, and a dynamic demand environment. Additionally, instability in the global credit markets, the impact of uncertainty regarding global central bank monetary policy, capital expenditure reductions, unemployment and other labor issues, decline in stock markets, the instability in the geopolitical environment in many parts of the world and the current economic challenges in China continue to put pressure on global economic conditions and our business and operating results. While the impact of the COVID-19 pandemic is lessening, the duration and severity of the impact of the pandemic on our business and results of operations in future periods remain uncertain. The extent of the impact of COVID-19 on our operational and financial performance will depend on certain developments, including but not limited to the duration and spread of the pandemic and its variants, implementation and duration of local, state and federal issued public health orders in each jurisdiction where we operate or in which our customers and suppliers operate, impact on our customers and our sales cycles, impact on our supply chain and manufacturing partners, impact on our employees and impact on regional and worldwide economies and financial markets in general, all of which are uncertain and not predictable. We assessed the potential impact that this pandemic has on our estimates as of December 31, 2022 and determined that there were no material impacts. However, due to the global supply chain constraint, we have had to incur incremental supply and procurement costs in order to fulfill demand from our customers. As of December 31, 2022, our inventory balance includes $18.0 million of incremental supply and procurement costs. We are also continuously monitoring the current developments in the ongoing war between Russia and Ukraine including the related export controls and resulting sanctions imposed on Russia by the U.S. and other countries. Additional factors such as increased inflation, escalating energy costs, constrained raw material availability, and related cost increases could impact the global economy. Although the global implications of the Russian/Ukraine war are difficult to predict at this time, we do not presently foresee direct material adverse effects upon our business. Business Combinations On August 3, 2022, we completed a merger with NeoPhotonics Corporation (“NeoPhotonics”). Our condensed consolidated financial statements include the operating results of NeoPhotonics for the period from the date of the closing of the merger through December 31, 2022. We have applied the acquisition method of accounting in accordance with Accounting Standards Codification (“ASC”) Topic 805, Business Combinations to account for this transaction. Refer to “Note 4. Business Combinations” for further discussion of the merger. On August 15, 2022, we completed a transaction to acquire IPG Photonics’ telecom transmission product lines. Our condensed consolidated financial statements include the operating results of this business unit for the period from the date of the acquisition through December 31, 2022. We have applied the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations to account for this transaction. Refer to “Note 4. Business Combinations” for further discussion of this acquisition. Fiscal Years We utilize a 52-53 week fiscal year ending on the Saturday closest to June 30th. Every fifth or sixth fiscal year will have a 53-week period. The additional week in a 53-week year is added to the third quarter, making such quarter consist of 14 weeks. Our fiscal 2023 is a 52-week year ending on July 1, 2023, with the quarter ended December 31, 2022 being a 13-week quarterly period. Our fiscal 2022 was a 52-week year that ended on July 2, 2022, with the quarter ended January 1, 2022 being a 13-week quarterly period. Principles of Consolidation These interim unaudited condensed consolidated financial statements include the accounts of Lumentum Holdings Inc. and its wholly-owned subsidiaries. All inter-company transactions and balances are eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation. The reclassification of the prior period amounts did not impact previously reported condensed consolidated financial statements. Accounting Policies The condensed consolidated financial statements and accompanying related notes should be read in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the fiscal year ended July 2, 2022. Except for the accounting policies for convertible instruments as a result of our adoption of Accounting Standards Update (“ASU”) 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity, described in “Note 2. Recently Issued Accounting Pronouncements”, there have been no significant changes to our accounting policies during the six months ended December 31, 2022.