Subsequent Events	9 Months Ended
Oct. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 15, 2016 (the “Closing Date”), the Company, with certain of its domestic subsidiaries as guarantors (the “Guarantors”), entered into the Amended and Restated Credit Agreement with the Lenders, and HSBC Bank USA, National Association, as administrative agent and as swing line lender and letter of credit issuer. The Amended and Restated Credit Agreement amended and restated the Prior Credit Agreement. Pursuant to the Amended and Restated Credit Agreement, the Lenders provided the Company with senior secured first lien credit facilities in an aggregate principal amount of $400.0 million, consisting of term loans in an aggregate initial principal amount of $150.0 million and revolving commitments in an aggregate principal amount of $250.0 million. Up to $40.0 million of the revolving commitments may be used to obtain letters of credit, up to $25.0 million of the revolving commitments may be used to obtain swing line loans, and up to $40.0 million of the revolving commitments may be used to obtain revolving loans and letters of credit in certain currencies other than U.S. Dollars. Each of the term loans and the revolving commitments is scheduled to mature on November 12, 2021. As of November 15, 2016, there were no amounts outstanding under the letters of credit, swing line loans and alternative currency sub-facilities. As of November 15, 2016, $247.0 million of borrowings were outstanding under the Amended and Restated Credit Agreement, consisting of $150.0 million in term loans and $97.0 million in revolving loans, and there was $153.0 million of undrawn revolving commitments. The proceeds of the revolving credit facility may be used by the Company for capital expenditures, permitted acquisitions, permitted dividends, working capital and general corporate purposes. The Amended and Restated Credit Agreement provides that, subject to certain conditions, the Company may request the establishment of one or more additional term loan facilities and/or increases to the revolving commitments in an aggregate principal amount not to exceed the sum of (a) $150.0 million and (b) the aggregate principal amount of all voluntary prepayments of term loans made prior to the date of incurrence of such additional term loan facilities and/or increases to the revolving commitments. The Lenders will have an opportunity to, but are not required to participate in the additional term loan facilities and/or revolving commitment increases. If the Lenders do not agree to provide such incremental facilities, the Company may request such additional and/or increased facilities from additional lenders. Interest on loans made under the Amended and Restated Credit Agreement in U.S. Dollars accrues, at Semtech’s option, at a rate per annum equal to (1) the New Base Rate (as defined below) plus a margin ranging from 0.25% to 1.25% depending upon Semtech’s consolidated leverage ratio or (2) LIBOR (determined with respect to deposits in U.S. Dollars) for an interest period to be selected by Semtech plus a margin ranging from 1.25% to 2.25% depending upon Semtech’s consolidated leverage ratio (such margin, the “New Applicable Margin”). The initial interest margin will be 2.00% for Base Rate loans and 1.00% for LIBOR rate loans, applicable until 2 business days following delivery of a compliance certificate by Semtech to the administrative agent with respect to the first fiscal period ending after the Closing Date. The “New Base Rate” is equal to a fluctuating rate equal to the highest of (a) the prime rate of the administrative agent, (b) ½ of 1% above the federal funds effective rate published by the Federal Reserve Bank of New York and (c) one-month LIBOR (determined with respect to deposits in U.S. Dollars) plus 1.00%. Interest on loans made under the Amended and Restated Credit Agreement in alternative currencies accrues at a rate per annum equal to LIBOR (determined with respect to deposits in the applicable alternative currency) (other than loans made in Canadian Dollars, for which a special reference rate for Canadian Dollars applies) for an interest period to be selected by Semtech plus the New Applicable Margin. Commitment fees on the unused portion of the revolving commitments accrue at a rate per annum ranging from 0.20% to 0.45% depending upon Semtech’s consolidated leverage ratio, provided the initial commitment fee shall be 0.40% per annum, applicable until 2 business days following delivery of a compliance certificate by Semtech to the administrative agent with respect to the first fiscal period ending after the Closing Date. With respect to letters of credit, Semtech will pay the administrative agent, for the account of the lenders under the revolving credit facility, letter of credit participation fees at a rate per annum equal to the applicable margin then in effect with respect to LIBOR-based loans under the revolving commitments on the face amount of all outstanding letters of credit. Semtech will also pay HSBC Bank USA, N.A., as the issuing bank, a fronting fee for each letter of credit issued under the Amended and Restated Credit Agreement at a rate equal to 0.125% per annum based on the maximum amount available to be drawn under each such letter of credit, as well as its customary documentation fees. All obligations of Semtech under the Amended and Restated Credit Agreement are unconditionally guaranteed by each of the Guarantors, which currently consist of all of the direct and indirect domestic subsidiaries of Semtech. Semtech and the Guarantors have also pledged substantially all of their assets to secure their obligations under the Amended and Restated Credit Agreement, including Semtech’s owned real property located in Camarillo, California. The outstanding principal balance of the term loans will be subject to repayment in quarterly installments beginning on the last day of Semtech’s fiscal quarter ending closest to January 31, 2017 in an amount equal to $3,750,000 per quarter for the first two years after the Closing Date, $4,697,500 per quarter in the third and fourth years following the Closing Date, and $5,625,000 per quarter in the fifth year following the Closing Date, with the balance being due at maturity on November 12, 2021. No amortization is required with respect to the revolving credit facility. Semtech may voluntarily prepay borrowings under the Amended and Restated Credit Agreement at any time and from time to time, without premium or penalty, other than customary “breakage costs” and fees for LIBOR-based loans. The term loans must be mandatorily prepaid using the proceeds of certain dispositions of assets and receipt of insurance proceeds, subject to agreed-upon thresholds and exceptions and customary reinvestment rights. The Amended and Restated Credit Agreement contains customary covenants, including limitations on Company’s ability to, among other things, incur indebtedness, create liens on assets, engage in certain fundamental corporate changes, make investments, sell or otherwise dispose of assets, repurchase stock, pay dividends or make similar distributions, engage in certain transactions with affiliates and make capital expenditures. In addition, the Company must comply with the following financial covenants, tested at the end of each fiscal quarter on a trailing four-quarter basis: (i) a minimum consolidated interest coverage ratio of 3.00 to 1.00 and (ii) a maximum consolidated leverage ratio of 3.00 to 1.00 provided that, such maximum consolidated leverage ratio may be increased to 3.25 to 1.00 or 3.50 to 1.00, as applicable, for the four consecutive fiscal quarters ending on or after the date of consummation of a permitted acquisition which constitutes a “Material Acquisition” under the Amended and Restated Credit Agreement, subject to the satisfaction of certain conditions.

Subsequent Events

On November 15, 2016 (the “Closing Date”), the Company, with certain of its domestic subsidiaries as guarantors (the “Guarantors”), entered into the Amended and Restated Credit Agreement with the Lenders, and HSBC Bank USA, National Association, as administrative agent and as swing line lender and letter of credit issuer. The Amended and Restated Credit Agreement amended and restated the Prior Credit Agreement. Pursuant to the Amended and Restated Credit Agreement, the Lenders provided the Company with senior secured first lien credit facilities in an aggregate principal amount of $400.0 million, consisting of term loans in an aggregate initial principal amount of $150.0 million and revolving commitments in an aggregate principal amount of $250.0 million. Up to $40.0 million of the revolving commitments may be used to obtain letters of credit, up to $25.0 million of the revolving commitments may be used to obtain swing line loans, and up to $40.0 million of the revolving commitments may be used to obtain revolving loans and letters of credit in certain currencies other than U.S. Dollars. Each of the term loans and the revolving commitments is scheduled to mature on November 12, 2021. As of November 15, 2016, there were no amounts outstanding under the letters of credit, swing line loans and alternative currency sub-facilities.

As of November 15, 2016, $247.0 million of borrowings were outstanding under the Amended and Restated Credit Agreement, consisting of $150.0 million in term loans and $97.0 million in revolving loans, and there was $153.0 million of undrawn revolving commitments. The proceeds of the revolving credit facility may be used by the Company for capital expenditures, permitted acquisitions, permitted dividends, working capital and general corporate purposes.

The Amended and Restated Credit Agreement provides that, subject to certain conditions, the Company may request the establishment of one or more additional term loan facilities and/or increases to the revolving commitments in an aggregate principal amount not to exceed the sum of (a) $150.0 million and (b) the aggregate principal amount of all voluntary prepayments of term loans made prior to the date of incurrence of such additional term loan facilities and/or increases to the revolving commitments. The Lenders will have an opportunity to, but are not required to participate in the additional term loan facilities and/or revolving commitment increases. If the Lenders do not agree to provide such incremental facilities, the Company may request such additional and/or increased facilities from additional lenders.

Interest on loans made under the Amended and Restated Credit Agreement in U.S. Dollars accrues, at Semtech’s option, at a rate per annum equal to (1) the New Base Rate (as defined below) plus a margin ranging from 0.25% to 1.25% depending upon Semtech’s consolidated leverage ratio or (2) LIBOR (determined with respect to deposits in U.S. Dollars) for an interest period to be selected by Semtech plus a margin ranging from 1.25% to 2.25% depending upon Semtech’s consolidated leverage ratio (such margin, the “New Applicable Margin”). The initial interest margin will be 2.00% for Base Rate loans and 1.00% for LIBOR rate loans, applicable until 2 business days following delivery of a compliance certificate by Semtech to the administrative agent with respect to the first fiscal period ending after the Closing Date. The “New Base Rate” is equal to a fluctuating rate equal to the highest of (a) the prime rate of the administrative agent, (b) ½ of 1% above the federal funds effective rate published by the Federal Reserve Bank of New York and (c) one-month LIBOR (determined with respect to deposits in U.S. Dollars) plus 1.00%. Interest on loans made under the Amended and Restated Credit Agreement in alternative currencies accrues at a rate per annum equal to LIBOR (determined with respect to deposits in the applicable alternative currency) (other than loans made in Canadian Dollars, for which a special reference rate for Canadian Dollars applies) for an interest period to be selected by Semtech plus the New Applicable Margin.

Commitment fees on the unused portion of the revolving commitments accrue at a rate per annum ranging from 0.20% to 0.45% depending upon Semtech’s consolidated leverage ratio, provided the initial commitment fee shall be 0.40% per annum, applicable until 2 business days following delivery of a compliance certificate by Semtech to the administrative agent with respect to the first fiscal period ending after the Closing Date. With respect to letters of credit, Semtech will pay the administrative agent, for the account of the lenders under the revolving credit facility, letter of credit participation fees at a rate per annum equal to the applicable margin then in effect with respect to LIBOR-based loans under the revolving commitments on the face amount of all outstanding letters of credit. Semtech will also pay HSBC Bank USA, N.A., as the issuing bank, a fronting fee for each letter of credit issued under the Amended and Restated Credit Agreement at a rate equal to 0.125% per annum based on the maximum amount available to be drawn under each such letter of credit, as well as its customary documentation fees.

All obligations of Semtech under the Amended and Restated Credit Agreement are unconditionally guaranteed by each of the Guarantors, which currently consist of all of the direct and indirect domestic subsidiaries of Semtech. Semtech and the Guarantors have also pledged substantially all of their assets to secure their obligations under the Amended and Restated Credit Agreement, including Semtech’s owned real property located in Camarillo, California.

The outstanding principal balance of the term loans will be subject to repayment in quarterly installments beginning on the last day of Semtech’s fiscal quarter ending closest to January 31, 2017 in an amount equal to $3,750,000 per quarter for the first two years after the Closing Date, $4,697,500 per quarter in the third and fourth years following the Closing Date, and $5,625,000 per quarter in the fifth year following the Closing Date, with the balance being due at maturity on November 12, 2021. No amortization is required with respect to the revolving credit facility. Semtech may voluntarily prepay borrowings under the Amended and Restated Credit Agreement at any time and from time to time, without premium or penalty, other than customary “breakage costs” and fees for LIBOR-based loans.

The term loans must be mandatorily prepaid using the proceeds of certain dispositions of assets and receipt of insurance proceeds, subject to agreed-upon thresholds and exceptions and customary reinvestment rights.

The Amended and Restated Credit Agreement contains customary covenants, including limitations on Company’s ability to, among other things, incur indebtedness, create liens on assets, engage in certain fundamental corporate changes, make investments, sell or otherwise dispose of assets, repurchase stock, pay dividends or make similar distributions, engage in certain transactions with affiliates and make capital expenditures. In addition, the Company must comply with the following financial covenants, tested at the end of each fiscal quarter on a trailing four-quarter basis: (i) a minimum consolidated interest coverage ratio of 3.00 to 1.00 and (ii) a maximum consolidated leverage ratio of 3.00 to 1.00 provided that, such maximum consolidated leverage ratio may be increased to 3.25 to 1.00 or 3.50 to 1.00, as applicable, for the four consecutive fiscal quarters ending on or after the date of consummation of a permitted acquisition which constitutes a “Material Acquisition” under the Amended and Restated Credit Agreement, subject to the satisfaction of certain conditions.