Basis of Presentation	3 Months Ended
May 05, 2018
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 months ended May 5, 2018, 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 2018 audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended February 3, 2018. 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. The Company's financial results for prior periods presented herein have been recast to reflect certain businesses that were classified as discontinued operations during the fourth quarter of fiscal year 2017 and second quarter of fiscal year 2018. Certain prior year amounts have been reclassified to conform to current year presentation. These amounts were not material to any of the periods presented. 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 2018 had a 53-week year. Fiscal 2019 is a 52-week year. On November 19, 2017, the Company entered into an agreement and plan of merger (the “Merger Agreement”) with Cavium, Inc. (“Cavium”), pursuant to which a subsidiary of the Company will merge with and into Cavium, with Cavium surviving and becoming a wholly-owned indirect subsidiary of the Company (the "Merger"). Cavium is a provider of highly integrated semiconductor processors that enable intelligent processing for wired and wireless infrastructure and cloud for networking, communications, storage and security applications. The Merger is primarily intended to create an opportunity for the combined company to emerge as a leader in infrastructure solutions. Pursuant to the Merger Agreement, the Company will issue 2.1757 common shares and pay $40.00 per share in cash, without interest, for each share of Cavium common stock. The exchange ratio was based on a purchase price of $80 per share, using the Company's undisturbed price prior to November 3, when media reports of the transaction first surfaced. This represents a transaction value of approximately $6 billion. The merger consideration will be financed by a mix of cash, new debt financing and issuance of the Company's common stock. The Company intends to fund the cash consideration with a combination of cash on hand from the combined companies and $1.75 billion in debt financing. The Company has obtained commitments consisting of an $850 million bridge loan commitment and a $900 million committed term loan from Goldman Sachs Bank USA and Bank of America Merrill Lynch, in each case subject to customary terms and conditions. In addition, in connection with the Merger, the Company plans to obtain a $500 million revolving credit facility, borrowings under which will be used for general corporate purposes of the Company and its subsidiaries. The transaction is not subject to any financing condition. The Company has recorded $20.1 million of associated deferred debt and equity financing costs on the accompanying consolidated balance sheet as of May 5, 2018. The transaction is expected to close in mid-calendar 2018, subject to customary closing conditions, including receipt of regulatory approvals from China's State Administration for Market Regulation (formerly handled by China's MOFCOM Anti-Monopoly Bureau). The transaction has already satisfied the following closing conditions: (i) receipt of the required approval by Cavium shareholders, which was obtained on March 16, 2018; (ii) the expiration of the waiting period applicable to the consummation of the Merger under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, which expired on January 26, 2018, and (iii) the receipt of Committee on Foreign Investment in the U.S. ("CFIUS") approval, which was obtained on May 24, 2018. In certain circumstances, a termination fee of up to $180 million may be payable by the Company or Cavium upon termination of the transaction, as more fully described in the Merger Agreement.

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 months ended May 5, 2018, 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 2018 audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended February 3, 2018. 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. The Company's financial results for prior periods presented herein have been recast to reflect certain businesses that were classified as discontinued operations during the fourth quarter of fiscal year 2017 and second quarter of fiscal year 2018. Certain prior year amounts have been reclassified to conform to current year presentation. These amounts were not material to any of the periods presented.

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 2018 had a 53-week year. Fiscal 2019 is a 52-week year.

On November 19, 2017, the Company entered into an agreement and plan of merger (the “Merger Agreement”) with Cavium, Inc. (“Cavium”), pursuant to which a subsidiary of the Company will merge with and into Cavium, with Cavium surviving and becoming a wholly-owned indirect subsidiary of the Company (the "Merger"). Cavium is a provider of highly integrated semiconductor processors that enable intelligent processing for wired and wireless infrastructure and cloud for networking, communications, storage and security applications. The Merger is primarily intended to create an opportunity for the combined company to emerge as a leader in infrastructure solutions.

Pursuant to the Merger Agreement, the Company will issue 2.1757 common shares and pay $40.00 per share in cash, without interest, for each share of Cavium common stock. The exchange ratio was based on a purchase price of $80 per share, using the Company's undisturbed price prior to November 3, when media reports of the transaction first surfaced. This represents a transaction value of approximately $6 billion. The merger consideration will be financed by a mix of cash, new debt financing and issuance of the Company's common stock.

The Company intends to fund the cash consideration with a combination of cash on hand from the combined companies and $1.75 billion in debt financing. The Company has obtained commitments consisting of an $850 million bridge loan commitment and a $900 million committed term loan from Goldman Sachs Bank USA and Bank of America Merrill Lynch, in each case subject to customary terms and conditions. In addition, in connection with the Merger, the Company plans to obtain a $500 million revolving credit facility, borrowings under which will be used for general corporate purposes of the Company and its subsidiaries. The transaction is not subject to any financing condition. The Company has recorded $20.1 million of associated deferred debt and equity financing costs on the accompanying consolidated balance sheet as of May 5, 2018.

The transaction is expected to close in mid-calendar 2018, subject to customary closing conditions, including receipt of regulatory approvals from China's State Administration for Market Regulation (formerly handled by China's MOFCOM Anti-Monopoly Bureau). The transaction has already satisfied the following closing conditions: (i) receipt of the required approval by Cavium shareholders, which was obtained on March 16, 2018; (ii) the expiration of the waiting period applicable to the consummation of the Merger under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, which expired on January 26, 2018, and (iii) the receipt of Committee on Foreign Investment in the U.S. ("CFIUS") approval, which was obtained on May 24, 2018. In certain circumstances, a termination fee of up to $180 million may be payable by the Company or Cavium upon termination of the transaction, as more fully described in the Merger Agreement.