Organization and Basis of Presentation	3 Months Ended
Organization and Basis of Presentation	Apr. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Nature of Business Semtech Corporation (together with its consolidated subsidiaries, the "Company" or "Semtech") is a high-performance semiconductor, IoT systems and cloud connectivity service provider. The end customers for the Company’s silicon solutions are primarily original equipment manufacturers that produce and sell technology solutions. The Company’s IoT module, router, gateway and managed connectivity solutions ship to IoT device makers and enterprises to provide IoT connectivity to end devices. The Company designs, develops and markets a wide range of products for commercial applications, the majority of which are sold into the infrastructure, high-end consumer and industrial end markets. Basis of Presentation The Company reports results on the basis of 52 and 53-week periods and ends its fiscal year on the last Sunday in January. The other quarters generally end on the last Sunday of April, July and October. All quarters consist of 13 weeks except for one 14-week period in the fourth quarter of 53-week years. The first quarters of fiscal years 2024 and 2023 each consisted of 13 weeks. Principles of Consolidation The accompanying interim unaudited condensed consolidated financial statements include the accounts of the Company and its majority-owned subsidiaries and have been prepared in accordance with generally accepted accounting principles in the United States ("GAAP") and on the same basis as the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 29, 2023 ("Annual Report"). The Company’s interim unaudited condensed consolidated statements of operations are referred to herein as the "Statements of Operations," the Company’s interim unaudited condensed consolidated balance sheets are referred to herein as the "Balance Sheets," and the Company's interim unaudited condensed consolidated statements of cash flows are referred to herein as the "Statements of Cash Flows." In the opinion of the Company, these interim unaudited condensed consolidated financial statements contain all adjustments (consisting of normal recurring adjustments) necessary to present fairly, in all material respects, the financial position of the Company for the interim periods presented. All intercompany balances have been eliminated. Because the interim unaudited condensed consolidated financial statements do not include all of the information and notes required by GAAP for a complete set of consolidated financial statements, they should be read in conjunction with the audited consolidated financial statements and notes included in the Company's Annual Report. The results reported in these interim unaudited condensed consolidated financial statements should not be regarded as indicative of results that may be expected for any subsequent period or for the entire year. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Reclassification In fiscal year 2023, the Company reclassified amounts recorded for amortization of acquired technology intangible assets as a component of cost of sales. This was applied retrospectively and resulted in the reclassification of $1.0 million of amortization of acquired technology intangible assets for the three months ended May 1, 2022, from "Intangible amortization" within "Total operating costs and expenses, net" to "Amortization of acquired technology" within "Total cost of sales" in the Statements of Operations, which also had the impact of reducing gross profit by the same amount. This reclassification did not impact the Company's operating income, net income or earnings per share for any historical periods and also did not impact the Company's Balance Sheets or Statements of Cash Flows.