Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Dec. 25, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, and disclosures of contingencies at the date of the unaudited consolidated financial statements and the reported amounts of net sales and expenses during the reporting period. Such estimates relate to useful lives of fixed and intangible assets, allowances for doubtful accounts and customer returns and sales allowances. Such estimates could also relate to the fair value of acquired assets and liabilities, including goodwill and intangible assets, net realizable value of inventory, accrued liabilities, the valuation of stock-based awards, deferred tax valuation allowances, and other reserves. On an ongoing basis, management evaluates its estimates. Actual results could differ from those estimates, and such differences may be material to the unaudited condensed consolidated financial statements. Deferred Offering Costs The Company capitalizes certain legal, professional accounting and other third-party fees that are directly associated with in-process equity financings as deferred offering costs until such financings are consummated. After consummation of the equity financing, these costs are recorded in stockholder’s equity as a reduction of the additional paid-in capital generated as a result of the offering. As of December 25, 2020 and March 27, 2020, the Company had $0 and $0 of deferred offering costs, respectively. Concentrations of Credit Risk and Significant Customers Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents with financial institutions, which management believes to be of a high credit quality. To manage credit risk related to accounts receivables, the Company evaluates the creditworthiness of its customers and maintains allowances, to the extent necessary, for potential credit losses based upon the aging of its accounts receivable balances and known collection issues. The Company has not experienced any significant credit losses to date. As of December 25, 2020 and March 27, 2020, Sanken accounted for 19.8% and 33.8% of the Company’s outstanding trade accounts receivable, net, respectively, including related party trade accounts receivable. No other customers accounted for 10% or more of outstanding trade accounts receivable, net during those periods. For the three- and nine-month periods ended December 25, 2020, Sanken accounted for 16.1% and 17.4% of total net sales, respectively. No other customers accounted for 10% or more of total net sales for either of the three- and nine-month periods ended December 25, 2020. For the three- and nine-month periods ended December 27, 2019, Sanken accounted for 10.3% and 10.4% of total net sales, respectively. No other customers accounted for 10% or more of total net sales for either of the three- and nine-month periods ended December 27, 2019. During the three-month period ended December 25, 2020 sales from customers located outside of the United States accounted for, in the aggregate, 85.4% of the Company’s total net sales, with Greater China accounting for 28.1%, Japan accounting for 16.0% and South Korea accounting for 10.7%. No other countries accounted for greater than 10% of total net sales for the three-month period ended December 25, 2020. During the nine-month period ended December 25, 2020, sales from customers located outside of the United States, in the aggregate, accounted for 86.1% of the Company’s total net sales, with Greater China accounting for 27.9%, Japan accounting for 17.4% and South Korea accounting for 10.5%. No other countries accounted for greater than 10% of total net sales for the nine-month period ended December 25, 2020. During the three-month period ended December 27, 2019, sales from customers located outside of the United States, in the aggregate, accounted for 82.8% of the Company’s total net sales, with Japan accounting for 28.8% and Greater China accounting for 22.1%. No other countries accounted for greater than 10% of total net sales for the three-month period ended December 27, 2019. During the nine-month period ended December 27, 2019, sales from customers located outside of the United States, in the aggregate, accounted for 81.8% of the Company’s total net sales, with Japan accounting for 27.8% and Greater China accounting for 20.0%. No other countries accounted for greater than 10% of total net sales for the nine-month period ended December 27, 2019. Impact of Recently Issued Accounting Standards The Company qualifies as “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012 and has elected to “opt in” to the extended transition related to complying with new or revised accounting standards, which means that when a standard is issued or revised and it has different application dates for public and nonpublic companies, the Company will adopt the new or revised standard at the time nonpublic companies adopt the new or revised standard and will do so until such time that the Company either (i) irrevocably elects to “opt out” of such extended transition period or (ii) no longer qualifies as an emerging growth company. The Company may choose to early adopt any new or revised accounting standards whenever such early adoption is permitted for nonpublic companies. In February 2016, the Financial Accounting Standards Board (“FASB”) issued its new lease accounting guidance in ASU No. 2016-02, “Leases (Topic 842)” (“ASU 2016-02” or “the new lease standard”), subsequently amended by ASU 2018-11, Leases (Topic 842): Targeted Improvements. Under the new guidance, lessees will be required to recognize the following for all leases (with the exception of short-term leases) at the commencement date: a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessees will no longer be provided with a source of off-balance sheet financing. The new lease guidance also simplifies the accounting for sale and leaseback transactions primarily because lessees must recognize lease assets and lease liabilities. The standard is effective for public companies for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years (i.e., January 1, 2019, for a calendar-year entity). Early application is permitted. Entities have the option of using either a modified retrospective approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, or else a transition option (which the Company expects to use) allowing lessees to not apply the new lease standard in comparative periods but instead recognize a cumulative-effect adjustment to retained earnings as of the date of adoption. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. In May 2020, FASB issued ASU No. 2020-05 delaying the effective date of the new lease standard for nonpublic companies to fiscal years beginning after December 15, 2021 and interim periods within those fiscal years beginning after December 15, 2022. The Company expects to adopt this guidance during fiscal year 2022 and its assessment of the impact of adopting this standard is underway, including cataloging all leases, performing a preliminary analysis of the amounts of lease liabilities and right-of-use assets to be recorded and reviewing potential changes to the disclosures on leases. Based on this preliminary assessment, the Company does not expect the adoption of this standard to have a significant impact on its consolidated statement of operations. However, the Company expects that the recognition of right-of-use assets and corresponding lease liabilities will have a significant impact on its consolidated balance sheet. In June 2016, the FASB issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”), which adds an impairment model (known as the current expected credit loss (“CECL”) model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses, which the FASB believes will result in more timely recognition of such losses. The ASU is also intended to reduce the complexity by decreasing the number of credit impairment models that entities use to account for debt instruments. ASU 2016-03, along with its subsequent clarifications, was effective for public companies beginning after December 15, 2019 and is effective for nonpublic companies for fiscal years beginning after December 15, 2021. The Company is evaluating the new guidance and the expected effect on its consolidated financial statements and related disclosures. In November 2019, the FASB issued ASU No. 2019-10 delaying the effective date for all entities. For public entities, this guidance was effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years. For nonpublic entities, this guidance is effective for annual periods beginning after December 15, 2022, including interim periods within those fiscal years. In August 2018, the FASB issued ASU No. 2018-14, “Compensation—Retirement Benefits—Defined Benefit Plans—General (Topic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans” (“ASU 2018-14”), which modifies the disclosure requirements for defined benefit pension plans and other postretirement plans. ASU 2018-14 should be applied on a retrospective transition basis, and it is effective for public companies beginning after December 15, 2020 and for nonpublic companies beginning after December 15, 2021. The Company is evaluating the new guidance and the expected effect on its consolidated financial statements and related disclosures. In August 2018, the FASB issued ASU No. 2018-13, “Fair Value Measurement” (“ASU 2018-13”), which modifies the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, regarding transfers between levels of financial instruments, amounts of unrealized gains and losses included in other comprehensive (loss) income for Level 3 fair value measurements and the information used to determine the fair value of Level 3 fair value measurements. The standard is effective for both public and nonpublic companies, for annual periods beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently assessing the potential impact that the adoption of ASU 2018-13 will have on its consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes” (“ASU 2019-12”). ASU 2019-12 simplifies the accounting for income taxes by removing certain exceptions for intraperiod tax allocations and deferred tax liabilities for equity method investments and adds guidance on whether a step-up in tax basis of goodwill relates to a business combination or a separate transaction. This ASU is effective for fiscal years beginning after December 15, 2020 for public companies and for fiscal years beginning after December 15, 2021 for nonpublic companies, with early adoption permitted. The Company is evaluating the new guidance and the expected effect on its consolidated financial statements and related disclosures. In January 2020, the FASB issued ASU No. 2020-01, “Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815)” (“ASU 2020-01”), which addresses accounting for the transition into and out of the equity method and provides clarification of the interaction of rules for equity securities, the equity method of accounting, and forward contracts and purchase options on certain types of securities. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020 for public companies and beginning after December 15, 2021 for nonpublic entities with early adoption permitted. The Company is currently assessing the potential impact that the adoption of ASU 2020-01 will have on its consolidated financial statements. In March 2020, the FASB issued ASU No. 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (“ASU 2020-04”) to provide temporary optional expedients and exceptions to the contract modifications, hedge relationships, and other transactions affected by reference rate reform if certain criteria are met. This ASU, which was effective for all entities upon issuance on March 12, 2020 and may be applied through December 31, 2022, is applicable to all contracts and hedging relationships that reference the London Interbank Offered Rate (“LIBOR”) or any other reference rate expected to be discontinued. The Company is still assessing the impact that the adoption of ASU 2020-04 will have on its consolidated financial statements.