Subsequent Events	3 Months Ended
Apr. 28, 2013
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Refinancing of Credit Facilities On May 2, 2013, the Company, with each of its domestic subsidiaries as guarantors (the “Guarantors”), entered into a New Credit Agreement with the lenders referred to therein (the “Lenders”) and HSBC Bank USA, National Association, as administrative agent and as swing line lenders and letter of credit issuer. Pursuant to the New Credit Agreement, the Lenders provided Semtech with senior secured first lien credit facilities in an aggregate principal amount of $400.0 million (the “New Facilities”), consisting of term loans in aggregate principal amount of $150 million (the “Term Loans”) and revolving commitments in an aggregate principal amount of $250 million (the “Revolving Commitments”). 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 (“Alternative Currencies”). The Company has incurred loan fees of $3.5 million for the New Credit Agreement, of which $0.6 million has been incurred and recorded as of April 28, 2013. The loan fees will be amortized to interest expense over the five-year loan term commencing in the second quarter of fiscal year 2014. The New Facilities replace Semtech’s existing $350 million senior secured first lien term loan credit facilities entered into on March 20, 2012. The Prior Credit Facilities were terminated on the closing date of the New Credit Agreement. The unamortized debt costs of $6.5 million and remaining original issue discount of $2.2 million related to the Prior Credit Facilities will be expensed in the second quarter of fiscal 2014. As of April 28, 2013, the current portion of the long-term debt has been recorded based on payments that will be made for the New Credit Agreement in the next twelve months. In addition, the Company has classified the early prepayment of $26 million for the New Credit Agreement from “Long term debt” to “Current portion - long term debt” in the unaudited consolidated condensed balance sheets as of April 28, 2013. The prepayment of $26 million was made on June 3, 2013. The New Credit Agreement provides that, subject to certain conditions, Semtech may request, at any time and from time to time, 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 $100 million, the proceeds of which may be used for working capital and general corporate purposes. Interest on loans made under the New Credit Agreement in U.S. Dollars accrues, at Semtech’s option, at a rate per annum equal to (1) the 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. The “Base Rate” is equal to a fluctuating rate equal to the highest of (a) the prime rate, (b) ½ of 1% above the federal funds effective rate or (c) one-month LIBOR (determined with respect to deposits in U.S. Dollars) plus 1%. The New Credit Agreement includes a multi-currency subfacility where interest on loans made in Alternative Currencies (other than Canadian Dollars) accrues at a rate per annum equal to LIBOR (determined with respect to deposits in the applicable Alternative Currency) 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. Interest on loans made under the New Credit Agreement in Canadian Dollars accrues at a rate per annum equal to the CDOR Rate 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. 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. All obligations of Semtech under the New Facilities are unconditionally guaranteed by each of the Guarantors. The obligations of Semtech and the Guarantors in respect of the New Facilities are secured by a first priority security interest in substantially all of the assets of Semtech and the Guarantors, subject to certain customary exceptions. The New Facilities are subject to certain mandatory prepayments, representations and warranties, affirmative covenants, negative covenants, financial covenants and conditions that are customarily required for similar financings. The New Facilities also contain customary events of default. If any event of default occurs, the principal, interest and any other monetary obligations on all the then outstanding amounts under the New Facilities may become due and payable immediately.

Subsequent Events

Refinancing of Credit Facilities

On May 2, 2013, the Company, with each of its domestic subsidiaries as guarantors (the “Guarantors”), entered into a New Credit Agreement with the lenders referred to therein (the “Lenders”) and HSBC Bank USA, National Association, as administrative agent and as swing line lenders and letter of credit issuer. Pursuant to the New Credit Agreement, the Lenders provided Semtech with senior secured first lien credit facilities in an aggregate principal amount of $400.0 million (the “New Facilities”), consisting of term loans in aggregate principal amount of $150 million (the “Term Loans”) and revolving commitments in an aggregate principal amount of $250 million (the “Revolving Commitments”). 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 (“Alternative Currencies”).

The Company has incurred loan fees of $3.5 million for the New Credit Agreement, of which $0.6 million has been incurred and recorded as of April 28, 2013. The loan fees will be amortized to interest expense over the five-year loan term commencing in the second quarter of fiscal year 2014.

The New Facilities replace Semtech’s existing $350 million senior secured first lien term loan credit facilities entered into on March 20, 2012. The Prior Credit Facilities were terminated on the closing date of the New Credit Agreement. The unamortized debt costs of $6.5 million and remaining original issue discount of $2.2 million related to the Prior Credit Facilities will be expensed in the second quarter of fiscal 2014. As of April 28, 2013, the current portion of the long-term debt has been recorded based on payments that will be made for the New Credit Agreement in the next twelve months. In addition, the Company has classified the early prepayment of $26 million for the New Credit Agreement from “Long term debt” to “Current portion - long term debt” in the unaudited consolidated condensed balance sheets as of April 28, 2013. The prepayment of $26 million was made on June 3, 2013.

The New Credit Agreement provides that, subject to certain conditions, Semtech may request, at any time and from time to time, 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 $100 million, the proceeds of which may be used for working capital and general corporate purposes.

Interest on loans made under the New Credit Agreement in U.S. Dollars accrues, at Semtech’s option, at a rate per annum equal to (1) the 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. The “Base Rate” is equal to a fluctuating rate equal to the highest of (a) the prime rate, (b) ½ of 1% above the federal funds effective rate or (c) one-month LIBOR (determined with respect to deposits in U.S. Dollars) plus 1%. The New Credit Agreement includes a multi-currency subfacility where interest on loans made in Alternative Currencies (other than Canadian Dollars) accrues at a rate per annum equal to LIBOR (determined with respect to deposits in the applicable Alternative Currency) 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. Interest on loans made under the New Credit Agreement in Canadian Dollars accrues at a rate per annum equal to the CDOR Rate 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. 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.

All obligations of Semtech under the New Facilities are unconditionally guaranteed by each of the Guarantors. The obligations of Semtech and the Guarantors in respect of the New Facilities are secured by a first priority security interest in substantially all of the assets of Semtech and the Guarantors, subject to certain customary exceptions.

The New Facilities are subject to certain mandatory prepayments, representations and warranties, affirmative covenants, negative covenants, financial covenants and conditions that are customarily required for similar financings. The New Facilities also contain customary events of default. If any event of default occurs, the principal, interest and any other monetary obligations on all the then outstanding amounts under the New Facilities may become due and payable immediately.