Credit Facilities	9 Months Ended
Oct. 30, 2016
Debt Instruments [Abstract]
Credit Facilities	Credit Facilities On May 2, 2013, Semtech Corporation, with each of its domestic subsidiaries as guarantors (the “Prior Guarantors”), entered into a credit agreement (the “Prior Credit Agreement”) with the lenders referred to therein (the “Prior Lenders”) and HSBC Bank USA, National Association, as administrative agent and as swing line lender and letter of credit issuer. In accordance with the Prior Credit Agreement, the Prior Lenders provided Semtech Corporation with senior secured first lien credit facilities in an aggregate principal amount of $400.0 million for a five year term, consisting of term loans in an aggregate initial principal amount of $150.0 million (the “Prior Term Loans”) and revolving credit commitments in an aggregate principal amount of $250.0 million (the “Prior Revolving Commitments”). The Prior Revolving Commitments contained sub-facilities that could be used as follows: up to $40.0 million for letters of credit, up to $25.0 million for Swing Line Loans (as defined below), and up to $40.0 million for revolving loans and letters of credit in certain currencies other than U.S. Dollars (“Alternative Currencies”). “Swing Line Loans” refer to Base Rate (as defined below) loans made in immediately available funds denominated in dollars by the swing line lender in its sole and absolute discretion. As of October 30, 2016, there were no amounts outstanding under the letters of credit, Swing Line Loans, and Alternative Currencies. Interest on loans made under the Prior Credit Agreement in U.S. Dollars accrued, at Semtech’s option, at a rate per annum equal to (1) the Base Rate plus a margin ranging from 0.25% to 1.25% depending upon Semtech’s consolidated leverage ratio or (2) London Interbank Offered Rate (“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 (as published by The Wall Street Journal), (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%. Interest on loans in Alternative Currencies, other than Canadian Dollars, accrued 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 in Canadian Dollars accrued at a rate per annum equal to the CDOR Rate (as defined below) 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 “CDOR Rate” for any interest period is the rate equal to the sum of: (a) the rate determined by the administrative agent with reference to the arithmetic average of the discount rate quotations of all institutions listed for CAD Dollar-denominated bankers’ acceptances displayed and identified on the “Reuters Screen CDOR Page” and (b) 0.10% per annum. CDOR Commitment fees on the unused portion of the Prior Revolving Commitments accrued at a rate per annum ranging from 0.20% to 0.45% depending upon Semtech’s consolidated leverage ratio. Interest was payable monthly for a Base Rate loan and swing line loan and quarterly for a Euro dollar rate loan. As of October 30, 2016, the interest rates payable on both the Prior Term Loans and the Prior Revolving Commitments was 2.28%. As of October 30, 2016, there was $67.8 million outstanding under the Prior Term Loans and $181.0 million in revolving loans outstanding pursuant to the Prior Revolving Commitments. The Prior Term Loans and the Prior Revolving Commitments (and related revolving loans) were scheduled to mature on May 1, 2018. All obligations of Semtech Corporation under the Prior Credit Agreement were unconditionally guaranteed by each of the Prior Guarantors and were secured by a first priority security interest in substantially all of the assets of Semtech Corporation and the Prior Guarantors, subject to certain customary exceptions. Semtech Corporation and the Prior Guarantors were subject to customary covenants under the Prior Credit Agreement, including the maintenance of a minimum interest ratio of 3.50 to 1.00 and a maximum total consolidated leverage ratio of 3.00 to 1.00. Semtech Corporation and the Prior Guarantors were in compliance with such financial covenants as of October 30, 2016. The Prior Credit Agreement also contained customary provisions pertaining to events of default. If any event of default had occurred, the principal, interest, and any other monetary obligations on all the then outstanding amounts could have become due and payable immediately. On November 15, 2016, the Company, with each of its domestic subsidiaries as guarantors, entered into an amended and restated credit agreement (the “Amended and Restated Credit Agreement”) with the lenders referred to therein (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 consists of a senior secured term A loan facility in the principal amount of $150.0 million and a senior secured revolving credit facility in the principal amount of $250.0 million, each of which is scheduled to mature in November 2021. The Amended and Restated Credit Agreement amended and restated the Prior Credit Agreement that was scheduled to mature in May of 2018 (see Note 20 for discussion regarding Subsequent Events).

Credit Facilities

On May 2, 2013, Semtech Corporation, with each of its domestic subsidiaries as guarantors (the “Prior Guarantors”), entered into a credit agreement (the “Prior Credit Agreement”) with the lenders referred to therein (the “Prior Lenders”) and HSBC Bank USA, National Association, as administrative agent and as swing line lender and letter of credit issuer. In accordance with the Prior Credit Agreement, the Prior Lenders provided Semtech Corporation with senior secured first lien credit facilities in an aggregate principal amount of $400.0 million for a five year term, consisting of term loans in an aggregate initial principal amount of $150.0 million (the “Prior Term Loans”) and revolving credit commitments in an aggregate principal amount of $250.0 million (the “Prior Revolving Commitments”). The Prior Revolving Commitments contained sub-facilities that could be used as follows: up to $40.0 million for letters of credit, up to $25.0 million for Swing Line Loans (as defined below), and up to $40.0 million for revolving loans and letters of credit in certain currencies other than U.S. Dollars (“Alternative Currencies”). “Swing Line Loans” refer to Base Rate (as defined below) loans made in immediately available funds denominated in dollars by the swing line lender in its sole and absolute discretion. As of October 30, 2016, there were no amounts outstanding under the letters of credit, Swing Line Loans, and Alternative Currencies.

Interest on loans made under the Prior Credit Agreement in U.S. Dollars accrued, at Semtech’s option, at a rate per annum equal to (1) the Base Rate plus a margin ranging from 0.25% to 1.25% depending upon Semtech’s consolidated leverage ratio or (2) London Interbank Offered Rate (“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 (as published by The Wall Street Journal), (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%. Interest on loans in Alternative Currencies, other than Canadian Dollars, accrued 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 in Canadian Dollars accrued at a rate per annum equal to the CDOR Rate (as defined below) 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 “CDOR Rate” for any interest period is the rate equal to the sum of: (a) the rate determined by the administrative agent with reference to the arithmetic average of the discount rate quotations of all institutions listed for CAD Dollar-denominated bankers’ acceptances displayed and identified on the “Reuters Screen CDOR Page” and (b) 0.10% per annum. CDOR Commitment fees on the unused portion of the Prior Revolving Commitments accrued at a rate per annum ranging from 0.20% to 0.45% depending upon Semtech’s consolidated leverage ratio. Interest was payable monthly for a Base Rate loan and swing line loan and quarterly for a Euro dollar rate loan. As of October 30, 2016, the interest rates payable on both the Prior Term Loans and the Prior Revolving Commitments was 2.28%.

As of October 30, 2016, there was $67.8 million outstanding under the Prior Term Loans and $181.0 million in revolving loans outstanding pursuant to the Prior Revolving Commitments. The Prior Term Loans and the Prior Revolving Commitments (and related revolving loans) were scheduled to mature on May 1, 2018.

All obligations of Semtech Corporation under the Prior Credit Agreement were unconditionally guaranteed by each of the Prior Guarantors and were secured by a first priority security interest in substantially all of the assets of Semtech Corporation and the Prior Guarantors, subject to certain customary exceptions.

Semtech Corporation and the Prior Guarantors were subject to customary covenants under the Prior Credit Agreement, including the maintenance of a minimum interest ratio of 3.50 to 1.00 and a maximum total consolidated leverage ratio of 3.00 to 1.00. Semtech Corporation and the Prior Guarantors were in compliance with such financial covenants as of October 30, 2016.

The Prior Credit Agreement also contained customary provisions pertaining to events of default. If any event of default had occurred, the principal, interest, and any other monetary obligations on all the then outstanding amounts could have become due and payable immediately.

On November 15, 2016, the Company, with each of its domestic subsidiaries as guarantors, entered into an amended and restated credit agreement (the “Amended and Restated Credit Agreement”) with the lenders referred to therein (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 consists of a senior secured term A loan facility in the principal amount of $150.0 million and a senior secured revolving credit facility in the principal amount of $250.0 million, each of which is scheduled to mature in November 2021. The Amended and Restated Credit Agreement amended and restated the Prior Credit Agreement that was scheduled to mature in May of 2018 (see Note 20 for discussion regarding Subsequent Events).