The Company and Summary of Significant Accounting Policies and Estimates (Policies)	6 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The condensed consolidated interim financial statements include the accounts of Logitech and its subsidiaries. All intercompany balances and transactions have been eliminated. The condensed consolidated financial statements are presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and therefore do not include all the information required by GAAP for complete financial statements. They should be read in conjunction with the Company’s audited consolidated financial statements for the fiscal year ended March 31, 2018, included in its Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on May 21, 2018. In the opinion of management, these condensed consolidated financial statements include all adjustments, consisting of only normal and recurring adjustments, necessary and in all material aspects, for a fair statement of the results of operations, comprehensive income, financial position, cash flows and changes in shareholders' equity for the periods presented. Operating results for the three and six months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the fiscal year ending March 31, 2019, or any future periods.
Reclassification	Reclassification Certain amounts from the comparative period in the accompanying condensed consolidated financial statements have been reclassified to conform to the condensed consolidated financial statement presentation as of and for the three and six months ended September 30, 2018.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make judgments, estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements. Management bases its estimates on historical experience and various other assumptions believed to be reasonable. Significant estimates and assumptions made by management involve the fair value of goodwill, intangible assets acquired from business acquisitions, warranty liabilities, accruals for customer incentives, cooperative marketing, and pricing programs ("Customer Programs") and related breakage when appropriate, accrued revenue reserve from returns, allowance for doubtful accounts, inventory valuation, contingent consideration from business acquisitions and periodical reassessment of its fair value, share-based compensation expense, uncertain tax positions, and valuation allowances for deferred tax assets. 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 could differ materially from these estimates.
Recent Accounting Pronouncements Issued and Adopted	In January 2016, the FASB issued ASU 2016-01, "Financial Instruments-Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10)" ("ASU 2016-01"). ASU 2016-01 requires entities to measure equity instruments at fair value and recognize any changes in fair value within the statement of operations. The Company adopted ASU 2016-01 effective April 1, 2018 on a prospective basis for its privately held strategic equity securities without readily determinable fair values. The Company elected the measurement alternative to record these investments at cost and to adjust for impairments and observable price changes with a same or similar security from the same issuer within the statement of operations. The adoption of ASU 2016-01 did not have a material impact on the Company's condensed consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory" ("ASU 2016-16"), which eliminates the deferral of income tax effects of intra-entity asset transfers until the transferred asset is sold to an unrelated party or recovered through use. However, this standard does not apply to intra-entity transfer of inventory. The Company adopted this standard effective April 1, 2018 on a modified retrospective basis, and the adoption of ASU 2016-16 did not have a material impact on its condensed consolidated financial statements. In December 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash" ("ASU 2016-18"), which requires that a statement of cash flows explains the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The Company adopted this standard effective April 1, 2018, utilizing the retrospective transition method to each period presented and the adoption of ASU 2016-18 did not have an impact on its condensed consolidated financial statements as the Company did not have restricted cash for either periods presented. In January 2017, the FASB issued ASU 2017-01, "Business Combination (Topic 805): Clarifying the Definition of a Business" ("ASU 2017-01"), which changes the definition of a business to assist with evaluating when a set of transferred assets and activities is a business. The Company adopted this standard effective April 1, 2018, and the adoption of ASU 2017-01 did not have a material impact on its condensed consolidated financial statements. In March 2017, the FASB issued ASU 2017-07, "Compensation-Retirement Benefit (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" ("ASU 2017-07"), which requires that the Company disaggregate the service cost component from the other components of net benefit cost, and also provides guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. The Company adopted this standard effective April 1, 2018 using a retrospective adoption method. Other than the revised statement of operations presentation for the periods in the current year, the adoption of ASU 2017-07 did not have an impact on the Company’s condensed consolidated financial statements. The impact to the comparative period was immaterial and therefore the prior period statements of operations was not revised. In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" ("ASU 2017-12"), which improves the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements and simplifies the application of the hedge accounting guidance. The Company adopted this standard prospectively on April 1, 2018, and the adoption of ASU 2017-12 did not have a material impact on its condensed consolidated financial statements. In accordance with ASU 2017-12, the Company has started presenting the earnings impact from forward points in cost of goods sold line item, which is used to present the earnings impact of the hedged item. Recent Accounting Pronouncements to be Adopted In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)" ("ASU 2016-02" or "Topic 842"), which generally requires companies to recognize right-of-use assets and lease liabilities arising from operating and financing leases with terms longer than 12 months in the consolidated balance sheets. The Company will adopt the new guidance in the first quarter of fiscal year 2020 on a modified retrospective basis, which recognizes the cumulative effect of initially applying Topic 842 as an adjustment to retained earnings at the adoption date. Although the Company expects to record significant amounts of right-of-use assets and liabilities on its condensed consolidated balance sheets, the Company is still evaluating the full impact that ASU 2016-02 will have on its condensed consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, "Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurements" ("ASU 2018-13"), which aims to improve the overall usefulness of disclosures to financial statement users and reduce unnecessary costs to companies when preparing fair value measurement disclosures. ASU 2018-13 is effective for annual and interim periods in fiscal years beginning after December 15, 2019. Early adoption is permitted. Retrospective adoption is required, except for certain disclosures which will be required to be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. The Company is evaluating the full effect that ASU 2018-13 will have on its condensed consolidated financial statements and the timing of adoption. In August 2018, the FASB issued ASU 2018-14, "Compensation - Retirement Benefits - Defined Benefits Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans" ("ASU 2018-14"), which aims to improve the overall usefulness of disclosures to financial statement users and reduce unnecessary costs to companies when preparing defined benefit plan disclosures. ASU 2018-14 is effective for annual periods in fiscal years ending after December 15, 2021. Retrospective adoption is required and early adoption is permitted. The Company is evaluating the full effect that ASU 2018-14 will have on its condensed consolidated financial statements and the timing of adoption. In August 2018, the FASB issued ASU 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" ("ASU 2018-15"), which clarifies that implementation costs incurred by customers in cloud computing arrangements are deferred if they would be capitalized by customers in software licensing arrangements under the internal-use software guidance. ASU 2018-15 is effective for annual and interim periods in fiscal years beginning after December 15, 2019, with early adoption permitted. Entities have the option to apply the guidance prospectively to all implementation costs incurred after the date of adoption or retrospectively. The Company is evaluating the full effect that ASU 2018-15 will have on its condensed consolidated financial statements and the timing of adoption. Recent Accounting Pronouncements Adopted In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") No. 2014-09, "Revenue from Contracts with Customers (Topic 606)" ("ASU 2014-09" or “Topic 606”) which supersedes the revenue recognition requirements under ASC 605 (“Topic 605”), Revenue Recognition. ASU 2014-09 outlines a new, single, comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes existing revenue recognition guidance, including industry-specific guidance. Under the new guidance, recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new standard requires reporting companies to disclose the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. On April 1, 2018, the Company adopted the new standard and all related amendments using the modified retrospective method applied to those contracts which were not completed as of April 1, 2018. Results for reporting periods beginning after April 1, 2018 are presented under Topic 606, while prior period amounts are not adjusted and continue to be reported in accordance with historic accounting standards under Topic 605. As result of the adoption of the new standard, the Company recorded: a) a reduction to retained earnings as of April 1, 2018; and b) reclassifications of certain allowances for sales returns and certain other Customer Programs from accounts receivable, net to accrued and other current liabilities and other current assets.
Revenue Recognition	Revenue Recognition Revenue is recognized when a customer obtains control of promised goods or service in an amount that reflects the transaction price the Company expects to receive in exchange for those goods or services. Substantially all revenue recognized by the Company relates to the contracts with customers to sell products that allow people to connect through music, gaming, video, computing, and other digital platforms. These products are hardware devices, which may include embedded software, and these functions together are considered as one performance obligation. Hardware devices are generally plug and play, requiring no configuration and little or no installation. Revenue is recognized at a point in time when control of the products is transferred to the customer which generally occurs upon shipment. The Company’s contracts with its customers generally have a term of no more than one year. The Company applies the practical expedient of not disclosing the value of unsatisfied performance obligations for contracts with an original expected length of one year or less. The Company also provides post-contract customer support (“PCS”) for products and related software, which includes unspecified software updates and upgrades, bug fixes and maintenance. The transaction price is allocated to two performance obligations in such contracts, based on a relative standalone selling price. The transaction price allocated to PCS is recognized as revenue on a straight-line basis over the estimated term of the support, which is between one to two years, and is not material for the periods presented herein. Deferred revenue associated with remaining PCS performance obligation is not material as of September 30, 2018 and March 31, 2018. The Company normally requires payments from customers within thirty to sixty days from invoice date. However, terms may vary by customer type, by country and by selling season. Extended payment terms are sometimes offered to a limited number of customers during the second and third fiscal quarters. The Company does not modify payment terms on existing receivables. The Company's contracts with customers typically do not include significant financing components as the period between the satisfaction of performance obligations and timing of payment are generally within one year. The transaction price received by the Company from sales to its distributors, retail companies ("retailers"), and authorized resellers is calculated as selling price net of variable consideration which may include product returns, price protection, and the Company’s payments for Customer Programs related to current period product revenue. The estimated impact of these programs is recorded as a reduction of sales or as an operating expense if the Company receives a distinct good or service from the customer and can reasonably estimate the fair value of that good or service received. Significant management judgment and estimates are used to determine the impact of these programs in any accounting period. Certain Customer Programs require management to estimate the percentage of those programs which will not be claimed or will not be earned by customers based on historical experience and on the specific terms and conditions of particular programs. The percentage of these customer programs that will not be claimed or earned is commonly referred to as "breakage". The Company accounts for breakage as part of variable consideration, subject to constraint, and records the estimated impact in the same period when revenue is recognized at the expected value considering constraints. Significant management judgments and estimates are used to determine the breakage of the programs in any accounting period. The Company enters into cooperative marketing arrangements with many of its customers and with certain indirect partners, allowing customers to receive a credit equal to a set percentage of their purchases of the Company's products, or a fixed dollar credit for various marketing and incentive programs. The objective of these arrangements is to encourage advertising and promotional events to increase sales of the Company's products. Customer incentive programs include consumer rebates and performance-based incentives. Consumer rebates are offered to the Company's customers and indirect partners at the Company's discretion for the primary benefit of end-users. In addition, the Company offers performance-based incentives to many of its customers and indirect partners based on predetermined performance criteria. At management's discretion, the Company also offers special pricing discounts to certain customers. Special pricing discounts are usually offered only for limited time periods or for sales of selected products to specific indirect partners. Estimates of required accruals for cooperative marketing arrangements and customer incentive programs are determined based on negotiated terms, consideration of historical experience, forecasted incentives, anticipated volume of future purchases, and inventory levels in the channel. The Company has agreements with certain customers that contain terms allowing price protection credits to be issued in the event of a subsequent price reduction. Management's decision to make price reductions is influenced by product life cycle stage, market acceptance of products, the competitive environment, new product introductions and other factors. Accruals for estimated expected future pricing actions are recognized at the time of sale based on analyses of historical pricing actions by customer and by product, inventories owned by and located at customers, current customer demand, current operating conditions, and other relevant customer and product information, such as stage of product life-cycle. Product return rights vary by customer. Estimates of expected future product returns qualify as variable consideration and are recorded as a reduction of the transaction price of the contract at the time of sale based on analyses of historical return trends by customer and by product, inventories owned by and located at customers, current customer demand, current operating conditions, and other relevant customer and product information. The Company assesses the estimated returned asset value for impairment, and adjusts the value of the asset if it becomes impaired. Return trends are influenced by product life cycle status, new product introductions, market acceptance of products, sales levels, product sell-through, the type of customer, seasonality, product quality issues, competitive pressures, operational policies and procedures, and other factors. Return rates can fluctuate over time but are sufficiently predictable to allow the Company to estimate expected future product returns. Typically, variable consideration does not need to be constrained as estimates are based on predictive historical data or future commitments that are planned and controlled by the Company. However, the Company continues to assess variable consideration estimates such that it is probable that a significant reversal of revenue will not occur. The Company regularly evaluates the adequacy of its estimates for Customer Programs and product returns. Future market conditions and product transitions may require the Company to take action to change such programs and related estimates. When the variables used to estimate these costs change, or if actual costs differ significantly from the estimates, the Company would be required to record incremental increases or reductions to sales or operating expenses. Sales taxes and value added taxes (“VAT”) collected from customers, if applicable, which are remitted to governmental authorities are not included in revenue, and are reflected as a liability on the condensed consolidated balance sheets. The Company has elected to exclude sales taxes from the revenue recognized from contracts with customers. Shipping and Handling Costs The Company's shipping and handling costs are included in cost of goods sold in the condensed consolidated statements of operations for all periods presented. Contract Balances The Company records accounts receivable from contracts with customers when it has an unconditional right to consideration, as accounts receivable, net on the condensed consolidated balance sheet. The Company records contract liabilities when cash payments are received or due in advance of performance, primarily for implied support and subscriptions. Contract liabilities are included in accrual and other current liabilities on the condensed consolidated balance sheets. As of September 30, 2018 and for the period then ended, and as of April 1, 2018, the Company did not have any material contract liabilities balances or changes. Contract Costs The Company recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that otherwise would have been recognized is one year or less. These costs are included in marketing and selling expenses in the condensed consolidated statements of operations.
Allowance for Doubtful Accounts	Allowances for Doubtful Accounts Allowances for doubtful accounts are maintained for estimated losses resulting from the Company's customers' inability to make required payments. The allowances are based on the Company's regular assessment of the financial condition of specific customers, as well as its historical experience with bad debts and customer deductions, receivables aging, current economic trends, geographic or country specific risks and the financial condition of its distribution channels.