Basis of Presentation	9 Months Ended
Oct. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed consolidated financial statements of Marvell Technology Group Ltd., a Bermuda exempted company, and its wholly owned subsidiaries (the “Company”), as of and for the three and nine months ended October 31, 2020, have been prepared as required by the U.S. Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted as permitted by the SEC. These unaudited condensed consolidated financial statements and related notes should be read in conjunction with the Company's fiscal year 2020 audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended February 1, 2020. In the opinion of management, the financial statements include all adjustments, including normal recurring adjustments and other adjustments, that are considered necessary for fair presentation of the Company’s financial position and results of operations. All inter-company accounts and transactions have been eliminated. Operating results for the periods presented herein are not necessarily indicative of the results that may be expected for the entire year. Certain prior year amounts have been reclassified to conform to current year presentation. These amounts were not material to any of the periods presented. These financial statements should also be read in conjunction with the Company’s critical accounting policies included in the Company’s Annual Report on Form 10-K for the year ended February 1, 2020 and those included in this Form 10-Q below. The Company’s fiscal year is the 52- or 53-week period ending on the Saturday closest to January 31. Accordingly, every fifth or sixth fiscal year will have a 53-week period. The additional week in a 53-week year is added to the fourth quarter, making such quarter consist of 14 weeks. Fiscal 2020 had a 52-week year. Fiscal 2021 is a 52-week year. On October 29, 2020, the Company entered into a merger agreement (the “Merger Agreement”) with Inphi Corporation (“Inphi”), whereby the Company will pay Inphi's stockholders $66 per share in cash and 2.323 common shares for each Inphi share, which represents purchase consideration of approximately $10 billion. The Company intends to fund the cash consideration with $4.0 billion in debt financing, and has obtained commitments consisting of a $2.5 billion bridge loan commitment, a $750 million 3-year term loan facility commitment and a $750 million 5-year term loan facility commitment from JP Morgan Chase Bank, N.A., in each case subject to customary terms and conditions. The transaction is not subject to any financing condition. The Company has recorded $22.3 million of associated deferred debt financing costs, with $11.2 million recorded in prepaid expenses and other current assets and $11.1 million recorded in other non-current assets on the accompanying unaudited condensed consolidated balance sheet as of October 31, 2020. The transaction is expected to close in the second half of calendar 2021, pending approval by Inphi's and the Company's stockholders, as well as regulatory approval and satisfaction of other customary closing conditions. As a result of the transaction, the parent company will be domiciled in the United States upon closing of the transaction. For periods after closing, the combined company will be subject to taxation in the United States, which may adversely impact the Company's future effective tax rates and tax liabilities. A fee of up to $460 million may be payable by the Company or $300 million payable by Inphi upon termination of the transaction, as more fully described in the Merger Agreement. If the Merger Agreement is terminated due to failure to obtain stockholder approval, the party whose stockholders did not approve the transaction will be obligated to reimburse the other party up to $25 million for its merger related fees and costs. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent liabilities. On an ongoing basis, the Company evaluates its estimates, including those related to revenue recognition, provisions for sales returns and allowances, inventory excess and obsolescence, goodwill and other intangible assets, restructuring, income taxes, litigation and other contingencies. Actual results could differ from these estimates and such differences could affect the results of operations reported in future periods. In the current macroeconomic environment affected by COVID-19, these estimates require increased judgment and carry a higher degree of variability and volatility. As events continue to evolve and additional information becomes available, these estimates may change materially in future periods.

The unaudited condensed consolidated financial statements of Marvell Technology Group Ltd., a Bermuda exempted company, and its wholly owned subsidiaries (the “Company”), as of and for the three and nine months ended October 31, 2020, have been prepared as required by the U.S. Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted as permitted by the SEC. These unaudited condensed consolidated financial statements and related notes should be read in conjunction with the Company's fiscal year 2020 audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended February 1, 2020. In the opinion of management, the financial statements include all adjustments, including normal recurring adjustments and other adjustments, that are considered necessary for fair presentation of the Company’s financial position and results of operations. All inter-company accounts and transactions have been eliminated. Operating results for the periods presented herein are not necessarily indicative of the results that may be expected for the entire year. Certain prior year amounts have been reclassified to conform to current year presentation. These amounts were not material to any of the periods presented. These financial statements should also be read in conjunction with the Company’s critical accounting policies included in the Company’s Annual Report on Form 10-K for the year ended February 1, 2020 and those included in this Form 10-Q below.

The Company’s fiscal year is the 52- or 53-week period ending on the Saturday closest to January 31. Accordingly, every fifth or sixth fiscal year will have a 53-week period. The additional week in a 53-week year is added to the fourth quarter, making such quarter consist of 14 weeks. Fiscal 2020 had a 52-week year. Fiscal 2021 is a 52-week year.

On October 29, 2020, the Company entered into a merger agreement (the “Merger Agreement”) with Inphi Corporation (“Inphi”), whereby the Company will pay Inphi's stockholders $66 per share in cash and 2.323 common shares for each Inphi share, which represents purchase consideration of approximately $10 billion. The Company intends to fund the cash consideration with $4.0 billion in debt financing, and has obtained commitments consisting of a $2.5 billion bridge loan commitment, a $750 million 3-year term loan facility commitment and a $750 million 5-year term loan facility commitment from JP Morgan Chase Bank, N.A., in each case subject to customary terms and conditions. The transaction is not subject to any financing condition. The Company has recorded $22.3 million of associated deferred debt financing costs, with $11.2 million recorded in prepaid expenses and other current assets and $11.1 million recorded in other non-current assets on the accompanying unaudited condensed consolidated balance sheet as of October 31, 2020.

The transaction is expected to close in the second half of calendar 2021, pending approval by Inphi's and the Company's stockholders, as well as regulatory approval and satisfaction of other customary closing conditions. As a result of the transaction, the parent company will be domiciled in the United States upon closing of the transaction. For periods after closing, the combined company will be subject to taxation in the United States, which may adversely impact the Company's future effective tax rates and tax liabilities. A fee of up to $460 million may be payable by the Company or $300 million payable by Inphi upon termination of the transaction, as more fully described in the Merger Agreement. If the Merger Agreement is terminated due to failure to obtain stockholder approval, the party whose stockholders did not approve the transaction will be obligated to reimburse the other party up to $25 million for its merger related fees and costs.