Organization and Basis of Presentation	12 Months Ended
Jan. 27, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Semtech Corporation (together with its consolidated subsidiaries, the "Company" or "Semtech") is a global supplier of high-performance analog and mixed-signal semiconductors and advanced algorithms. The end-customers for the Company’s products are primarily original equipment manufacturers ("OEMs") that produce and sell electronics. The Company designs, develops, and markets a wide range of products for commercial applications, the majority of which are sold into the enterprise computing, communications, 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 fiscal years 2019, 2018 and 2017 each consisted of 52 weeks. Principles of Consolidation The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries and have been prepared in conformity with accounting principles generally accepted in the United States (“GAAP”). All intercompany balances have been eliminated. The Company’s Consolidated Statements of Income are referred to herein as the "Statements of Income." The Company’s Consolidated Balance Sheets are referred to herein as the "Balance Sheets" and Consolidated Statements of Cash Flows as the "Statements of Cash Flows." Use of Estimates The preparation of the consolidated 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 consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Settlements On August 1, 2018, the Company announced the settlement of a lawsuit filed against HiLight Semiconductor Limited and related individual defendants in accordance with which the Company is to be paid approximately $9.0 million to cover damages for claims, costs, and attorneys' fees. Approximately $8.0 million was received during fiscal year 2019, and is presented within "Selling, general and administrative" ("SG&A") in the Statements of Income.

Organization and Basis of Presentation

Semtech Corporation (together with its consolidated subsidiaries, the "Company" or "Semtech") is a global supplier of high-performance analog and mixed-signal semiconductors and advanced algorithms. The end-customers for the Company’s products are primarily original equipment manufacturers ("OEMs") that produce and sell electronics.

The Company designs, develops, and markets a wide range of products for commercial applications, the majority of which are sold into the enterprise computing, communications, 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 fiscal years 2019, 2018 and 2017 each consisted of 52 weeks.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries and have been prepared in conformity with accounting principles generally accepted in the United States (“GAAP”). All intercompany balances have been eliminated.

The Company’s Consolidated Statements of Income are referred to herein as the "Statements of Income." The Company’s Consolidated Balance Sheets are referred to herein as the "Balance Sheets" and Consolidated Statements of Cash Flows as the "Statements of Cash Flows."

Use of Estimates

The preparation of the consolidated 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 consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Settlements

On August 1, 2018, the Company announced the settlement of a lawsuit filed against HiLight Semiconductor Limited and related individual defendants in accordance with which the Company is to be paid approximately $9.0 million to cover damages for claims, costs, and attorneys' fees. Approximately $8.0 million was received during fiscal year 2019, and is presented within "Selling, general and administrative" ("SG&A") in the Statements of Income.