Basis of Presentation	12 Months Ended
Feb. 03, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The Company Marvell Technology Group Ltd., a Bermuda exempted company, and its subsidiaries (the “Company”), is a fabless semiconductor provider of high-performance application-specific standard products. The Company’s core strength is the development of complex System-on-a-Chip devices, leveraging its extensive technology portfolio of intellectual property in the areas of analog, mixed-signal, digital signal processing, and embedded and standalone integrated circuits. The Company also develops platforms that it defines as integrated hardware along with software that incorporates digital computing technologies designed and configured to provide an optimized computing solution. The Company’s broad product portfolio includes devices for storage, networking and connectivity. Basis of Presentation 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 is a 53-week year. Fiscal 2017 and 2016 each had a 52-week period. During the first fiscal quarter of 2018, the Company recorded certain out-of-period adjustments of $4.7 million related to revenue-related accruals and $3.2 million related to other expenses. The net effect of these out-of-period adjustments resulted in a $7.9 million increase in income from continuing operations for the year ended February 3, 2018, an increase in basic earnings per share from continuing operations of $0.02 per share, and an increase in diluted earnings per share from continuing operations of $0.02 per share, as well as contributing to the increase in revenue and gross margin for the year ended February 3, 2018. 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 $17.6 million of associated deferred debt and equity financing costs on the accompanying consolidated balance sheet as of February 3, 2018. The transaction is expected to close in mid-calendar 2018, subject to customary closing conditions, including, without limitation: (i) the required approval by Cavium shareholders and the Company’s shareholders, which was obtained on March 16, 2018; (ii) the expiration or early termination 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, (iii) the receipt of Committee on Foreign Investment in the U.S. ("CFIUS") approval, and (iv) the receipt of certain other foreign regulatory approvals. 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 Company

Marvell Technology Group Ltd., a Bermuda exempted company, and its subsidiaries (the “Company”), is a fabless semiconductor provider of high-performance application-specific standard products. The Company’s core strength is the development of complex System-on-a-Chip devices, leveraging its extensive technology portfolio of intellectual property in the areas of analog, mixed-signal, digital signal processing, and embedded and standalone integrated circuits. The Company also develops platforms that it defines as integrated hardware along with software that incorporates digital computing technologies designed and configured to provide an optimized computing solution. The Company’s broad product portfolio includes devices for storage, networking and connectivity.

Basis of Presentation

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 is a 53-week year. Fiscal 2017 and 2016 each had a 52-week period.

During the first fiscal quarter of 2018, the Company recorded certain out-of-period adjustments of $4.7 million related to revenue-related accruals and $3.2 million related to other expenses. The net effect of these out-of-period adjustments resulted in a $7.9 million increase in income from continuing operations for the year ended February 3, 2018, an increase in basic earnings per share from continuing operations of $0.02 per share, and an increase in diluted earnings per share from continuing operations of $0.02 per share, as well as contributing to the increase in revenue and gross margin for the year ended February 3, 2018.

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 $17.6 million of associated deferred debt and equity financing costs on the accompanying consolidated balance sheet as of February 3, 2018.

The transaction is expected to close in mid-calendar 2018, subject to customary closing conditions, including, without limitation: (i) the required approval by Cavium shareholders and the Company’s shareholders, which was obtained on March 16, 2018; (ii) the expiration or early termination 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, (iii) the receipt of Committee on Foreign Investment in the U.S. ("CFIUS") approval, and (iv) the receipt of certain other foreign regulatory approvals. 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.