3.20.1 html 450 543 1 true 123 0 false 4 false false R1.htm 000 - Document - Document And Entity Information Sheet http://www.smtc.com/20191229/role/statement-document-and-entity-information Document And Entity Information Cover 1 false false R2.htm 001 - Statement - Consolidated Balance Sheets Sheet http://www.smtc.com/20191229/role/statement-consolidated-balance-sheets Consolidated Balance Sheets Statements 2 false false R3.htm 002 - Statement - Consolidated Statements of Operations and Comprehensive Loss Sheet http://www.smtc.com/20191229/role/statement-consolidated-statements-of-operations-and-comprehensive-loss Consolidated Statements of Operations and Comprehensive Loss Statements 3 false false R4.htm 003 - Statement - Consolidated Statements of Changes in Shareholders' Equity Sheet http://www.smtc.com/20191229/role/statement-consolidated-statements-of-changes-in-shareholders-equity Consolidated Statements of Changes in Shareholders' Equity Statements 4 false false R5.htm 004 - Statement - Consolidated Statements of Cash Flows Sheet http://www.smtc.com/20191229/role/statement-consolidated-statements-of-cash-flows Consolidated Statements of Cash Flows Statements 5 false false R6.htm 005 - Disclosure - Note 1 - Nature of the Business Sheet http://www.smtc.com/20191229/role/statement-note-1-nature-of-the-business Note 1 - Nature of the Business Notes 6 false false R7.htm 006 - Disclosure - Note 2 - Impact of Adoption of ASC 842 Sheet http://www.smtc.com/20191229/role/statement-note-2-impact-of-adoption-of-asc-842 Note 2 - Impact of Adoption of ASC 842 Notes 7 false false R8.htm 007 - Disclosure - Note 3 - Significant Accounting Policies Sheet http://www.smtc.com/20191229/role/statement-note-3-significant-accounting-policies Note 3 - Significant Accounting Policies Notes 8 false false R9.htm 008 - Disclosure - Note 4 - Consolidated Financial Statement Details Sheet http://www.smtc.com/20191229/role/statement-note-4-consolidated-financial-statement-details Note 4 - Consolidated Financial Statement Details Notes 9 false false R10.htm 009 - Disclosure - Note 5 - Debt and Finance Leases Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases Note 5 - Debt and Finance Leases Notes 10 false false R11.htm 010 - Disclosure - Note 6 - Capital Stock Sheet http://www.smtc.com/20191229/role/statement-note-6-capital-stock Note 6 - Capital Stock Notes 11 false false R12.htm 011 - Disclosure - Note 7 - Stock-based Compensation Sheet http://www.smtc.com/20191229/role/statement-note-7-stockbased-compensation- Note 7 - Stock-based Compensation Notes 12 false false R13.htm 012 - Disclosure - Note 8 - Financial Instruments and Risks Sheet http://www.smtc.com/20191229/role/statement-note-8-financial-instruments-and-risks Note 8 - Financial Instruments and Risks Notes 13 false false R14.htm 013 - Disclosure - Note 9 - Income Taxes Sheet http://www.smtc.com/20191229/role/statement-note-9-income-taxes Note 9 - Income Taxes Notes 14 false false R15.htm 014 - Disclosure - Note 10 - Loss Per Share Sheet http://www.smtc.com/20191229/role/statement-note-10-loss-per-share Note 10 - Loss Per Share Notes 15 false false R16.htm 015 - Disclosure - Note 11 - Segmented Information Sheet http://www.smtc.com/20191229/role/statement-note-11-segmented-information Note 11 - Segmented Information Notes 16 false false R17.htm 016 - Disclosure - Note 12 - Commitments and Contingencies Sheet http://www.smtc.com/20191229/role/statement-note-12-commitments-and-contingencies Note 12 - Commitments and Contingencies Notes 17 false false R18.htm 017 - Disclosure - Note 13 - Defined Contribution Pension Plan and Post-employment Benefit Plan Sheet http://www.smtc.com/20191229/role/statement-note-13-defined-contribution-pension-plan-and-postemployment-benefit-plan Note 13 - Defined Contribution Pension Plan and Post-employment Benefit Plan Notes 18 false false R19.htm 018 - Disclosure - Note 14 - Restructuring Charges Sheet http://www.smtc.com/20191229/role/statement-note-14-restructuring-charges Note 14 - Restructuring Charges Notes 19 false false R20.htm 019 - Disclosure - Note 15 - Related Party Transactions Sheet http://www.smtc.com/20191229/role/statement-note-15-related-party-transactions Note 15 - Related Party Transactions Notes 20 false false R21.htm 020 - Disclosure - Note 16 - Acquisition of MC Assembly Sheet http://www.smtc.com/20191229/role/statement-note-16-acquisition-of-mc-assembly Note 16 - Acquisition of MC Assembly Notes 21 false false R22.htm 021 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.smtc.com/20191229/role/statement-significant-accounting-policies-policies Significant Accounting Policies (Policies) Policies http://www.smtc.com/20191229/role/statement-note-3-significant-accounting-policies 22 false false R23.htm 022 - Disclosure - Note 3 - Significant Accounting Policies (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-3-significant-accounting-policies-tables Note 3 - Significant Accounting Policies (Tables) Tables http://www.smtc.com/20191229/role/statement-note-3-significant-accounting-policies 23 false false R24.htm 023 - Disclosure - Note 4 - Consolidated Financial Statement Details (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-4-consolidated-financial-statement-details-tables Note 4 - Consolidated Financial Statement Details (Tables) Tables http://www.smtc.com/20191229/role/statement-note-4-consolidated-financial-statement-details 24 false false R25.htm 024 - Disclosure - Note 5 - Debt and Finance Leases (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-tables Note 5 - Debt and Finance Leases (Tables) Tables http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases 25 false false R26.htm 025 - Disclosure - Note 6 - Capital Stock (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-6-capital-stock-tables Note 6 - Capital Stock (Tables) Tables http://www.smtc.com/20191229/role/statement-note-6-capital-stock 26 false false R27.htm 026 - Disclosure - Note 7 - Stock-based Compensation (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-7-stockbased-compensation-tables Note 7 - Stock-based Compensation (Tables) Tables http://www.smtc.com/20191229/role/statement-note-7-stockbased-compensation- 27 false false R28.htm 027 - Disclosure - Note 8 - Financial Instruments and Risks (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-8-financial-instruments-and-risks-tables Note 8 - Financial Instruments and Risks (Tables) Tables http://www.smtc.com/20191229/role/statement-note-8-financial-instruments-and-risks 28 false false R29.htm 028 - Disclosure - Note 9 - Income Taxes (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-9-income-taxes-tables Note 9 - Income Taxes (Tables) Tables http://www.smtc.com/20191229/role/statement-note-9-income-taxes 29 false false R30.htm 029 - Disclosure - Note 10 - Loss Per Share (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-10-loss-per-share-tables Note 10 - Loss Per Share (Tables) Tables http://www.smtc.com/20191229/role/statement-note-10-loss-per-share 30 false false R31.htm 030 - Disclosure - Note 11 - Segmented Information (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-11-segmented-information-tables Note 11 - Segmented Information (Tables) Tables http://www.smtc.com/20191229/role/statement-note-11-segmented-information 31 false false R32.htm 031 - Disclosure - Note 14 - Restructuring Charges (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-14-restructuring-charges-tables Note 14 - Restructuring Charges (Tables) Tables http://www.smtc.com/20191229/role/statement-note-14-restructuring-charges 32 false false R33.htm 032 - Disclosure - Note 16 - Acquisition of MC Assembly (Tables) Sheet http://www.smtc.com/20191229/role/statement-note-16-acquisition-of-mc-assembly-tables Note 16 - Acquisition of MC Assembly (Tables) Tables http://www.smtc.com/20191229/role/statement-note-16-acquisition-of-mc-assembly 33 false false R34.htm 033 - Disclosure - Note 1 - Nature of the Business (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-1-nature-of-the-business-details-textual Note 1 - Nature of the Business (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-1-nature-of-the-business 34 false false R35.htm 034 - Disclosure - Note 2 - Impact of Adoption of ASC 842 (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-2-impact-of-adoption-of-asc-842-details-textual Note 2 - Impact of Adoption of ASC 842 (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-2-impact-of-adoption-of-asc-842 35 false false R36.htm 035 - Disclosure - Note 3 - Significant Accounting Policies - Intangible Asset Expected Useful Life (Details) Sheet http://www.smtc.com/20191229/role/statement-note-3-significant-accounting-policies-intangible-asset-expected-useful-life-details Note 3 - Significant Accounting Policies - Intangible Asset Expected Useful Life (Details) Details 36 false false R37.htm 036 - Disclosure - Note 3 - Significant Accounting Policies - Plant and Equipment, Expected Useful Lives (Details) Sheet http://www.smtc.com/20191229/role/statement-note-3-significant-accounting-policies-plant-and-equipment-expected-useful-lives-details Note 3 - Significant Accounting Policies - Plant and Equipment, Expected Useful Lives (Details) Details 37 false false R38.htm 037 - Disclosure - Note 3 - Significant Accounting Policies - Impact of Adoption of ASC 606 (Details) Sheet http://www.smtc.com/20191229/role/statement-note-3-significant-accounting-policies-impact-of-adoption-of-asc-606-details Note 3 - Significant Accounting Policies - Impact of Adoption of ASC 606 (Details) Details 38 false false R39.htm 038 - Disclosure - Note 4 - Consolidated Financial Statement Details (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-4-consolidated-financial-statement-details-details-textual Note 4 - Consolidated Financial Statement Details (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-4-consolidated-financial-statement-details-tables 39 false false R40.htm 039 - Disclosure - Note 4 - Consolidated Financial Statement Details - Consolidated Balance Sheets (Details) Sheet http://www.smtc.com/20191229/role/statement-note-4-consolidated-financial-statement-details-consolidated-balance-sheets-details Note 4 - Consolidated Financial Statement Details - Consolidated Balance Sheets (Details) Details 40 false false R41.htm 040 - Disclosure - Note 4 - Consolidated Financial Statement Details - Amortization Expense (Details) Sheet http://www.smtc.com/20191229/role/statement-note-4-consolidated-financial-statement-details-amortization-expense-details Note 4 - Consolidated Financial Statement Details - Amortization Expense (Details) Details 41 false false R42.htm 041 - Disclosure - Note 4 - Consolidated Financial Statement Details - Consolidated Statements of Operations and Comprehensive Income (Loss) (Details) Sheet http://www.smtc.com/20191229/role/statement-note-4-consolidated-financial-statement-details-consolidated-statements-of-operations-and-comprehensive-income-loss-details Note 4 - Consolidated Financial Statement Details - Consolidated Statements of Operations and Comprehensive Income (Loss) (Details) Details 42 false false R43.htm 042 - Disclosure - Note 5 - Debt and Finance Leases (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-details-textual Note 5 - Debt and Finance Leases (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-tables 43 false false R44.htm 043 - Disclosure - Note 5 - Debt and Finance Leases - Debt Facilities (Details) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-debt-facilities-details Note 5 - Debt and Finance Leases - Debt Facilities (Details) Details 44 false false R45.htm 044 - Disclosure - Note 5 - Debt and Finance Leases - Future Payments (Details) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-future-payments-details Note 5 - Debt and Finance Leases - Future Payments (Details) Details 45 false false R46.htm 045 - Disclosure - Note 5 - Debt and Finance Leases - Operating and Finance Lease Assets and Liabilities (Details) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-operating-and-finance-lease-assets-and-liabilities-details Note 5 - Debt and Finance Leases - Operating and Finance Lease Assets and Liabilities (Details) Details 46 false false R47.htm 046 - Disclosure - Note 5 - Debt and Finance Leases - Lease Cost (Details) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-lease-cost-details Note 5 - Debt and Finance Leases - Lease Cost (Details) Details 47 false false R48.htm 047 - Disclosure - Note 5 - Debt and Finance Leases - Maturity of Operating and Finance Lease Liabilities (Details) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-maturity-of-operating-and-finance-lease-liabilities-details Note 5 - Debt and Finance Leases - Maturity of Operating and Finance Lease Liabilities (Details) Details 48 false false R49.htm 048 - Disclosure - Note 5 - Debt and Finance Leases - Non-cancelable Operating Leases (Details) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-noncancelable-operating-leases-details Note 5 - Debt and Finance Leases - Non-cancelable Operating Leases (Details) Details 49 false false R50.htm 049 - Disclosure - Note 5 - Debt and Finance Leases - Non-cancelable Operating Leases (Details) (Parentheticals) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-noncancelable-operating-leases-details-parentheticals Note 5 - Debt and Finance Leases - Non-cancelable Operating Leases (Details) (Parentheticals) Details 50 false false R51.htm 050 - Disclosure - Note 5 - Debt and Finance Leases - Operating and Financing Leases Weighted Average (Details) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-operating-and-financing-leases-weighted-average-details Note 5 - Debt and Finance Leases - Operating and Financing Leases Weighted Average (Details) Details 51 false false R52.htm 051 - Disclosure - Note 5 - Debt and Finance Leases - Other Information (Details) Sheet http://www.smtc.com/20191229/role/statement-note-5-debt-and-finance-leases-other-information-details Note 5 - Debt and Finance Leases - Other Information (Details) Details 52 false false R53.htm 052 - Disclosure - Note 6 - Capital Stock (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-6-capital-stock-details-textual Note 6 - Capital Stock (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-6-capital-stock-tables 53 false false R54.htm 053 - Disclosure - Note 6 - Capital Stock - Common Shares Issued and Outstanding (Details) Sheet http://www.smtc.com/20191229/role/statement-note-6-capital-stock-common-shares-issued-and-outstanding-details Note 6 - Capital Stock - Common Shares Issued and Outstanding (Details) Details 54 false false R55.htm 054 - Disclosure - Note 7 - Stock-based Compensation (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-7-stockbased-compensation-details-textual Note 7 - Stock-based Compensation (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-7-stockbased-compensation-tables 55 false false R56.htm 055 - Disclosure - Note 7 - Stock-based Compensation - Stock Option Activity (Details) Sheet http://www.smtc.com/20191229/role/statement-note-7-stockbased-compensation-stock-option-activity-details Note 7 - Stock-based Compensation - Stock Option Activity (Details) Details 56 false false R57.htm 056 - Disclosure - Note 7 - Stock-based Compensation - Valuation Assumptions of Stock Options (Details) Sheet http://www.smtc.com/20191229/role/statement-note-7-stockbased-compensation-valuation-assumptions-of-stock-options-details Note 7 - Stock-based Compensation - Valuation Assumptions of Stock Options (Details) Details 57 false false R58.htm 057 - Disclosure - Note 7 - Stock-based Compensation - Valuation Assumptions of Stock Options with Market-based Performance Conditions (Details) Sheet http://www.smtc.com/20191229/role/statement-note-7-stockbased-compensation-valuation-assumptions-of-stock-options-with-marketbased-performance-conditions-details Note 7 - Stock-based Compensation - Valuation Assumptions of Stock Options with Market-based Performance Conditions (Details) Details 58 false false R59.htm 058 - Disclosure - Note 7 - Stock-based Compensation - Stock Options Outstanding (Details) Sheet http://www.smtc.com/20191229/role/statement-note-7-stockbased-compensation-stock-options-outstanding-details Note 7 - Stock-based Compensation - Stock Options Outstanding (Details) Details 59 false false R60.htm 059 - Disclosure - Note 7 - Stock-based Compensation - Restricted Stock Units Activity (Details) Sheet http://www.smtc.com/20191229/role/statement-note-7-stockbased-compensation-restricted-stock-units-activity-details Note 7 - Stock-based Compensation - Restricted Stock Units Activity (Details) Details 60 false false R61.htm 060 - Disclosure - Note 8 - Financial Instruments and Risks (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-8-financial-instruments-and-risks-details-textual Note 8 - Financial Instruments and Risks (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-8-financial-instruments-and-risks-tables 61 false false R62.htm 061 - Disclosure - Note 8 - Financial Instruments and Risks - Impact of Change in Interest Rates (Details) Sheet http://www.smtc.com/20191229/role/statement-note-8-financial-instruments-and-risks-impact-of-change-in-interest-rates-details Note 8 - Financial Instruments and Risks - Impact of Change in Interest Rates (Details) Details 62 false false R63.htm 062 - Disclosure - Note 8 - Financial Instruments and Risks - Impact of Exchange Rates (Details) Sheet http://www.smtc.com/20191229/role/statement-note-8-financial-instruments-and-risks-impact-of-exchange-rates-details Note 8 - Financial Instruments and Risks - Impact of Exchange Rates (Details) Details 63 false false R64.htm 063 - Disclosure - Note 8 - Financial Instruments and Risks - Outstanding Foreign Currency Forward Contracts (Details) Sheet http://www.smtc.com/20191229/role/statement-note-8-financial-instruments-and-risks-outstanding-foreign-currency-forward-contracts-details Note 8 - Financial Instruments and Risks - Outstanding Foreign Currency Forward Contracts (Details) Details 64 false false R65.htm 064 - Disclosure - Note 8 - Financial Instruments and Risks - Average USD Fair Value Measurements for Contracts Rates (Details) Sheet http://www.smtc.com/20191229/role/statement-note-8-financial-instruments-and-risks-average-usd-fair-value-measurements-for-contracts-rates-details Note 8 - Financial Instruments and Risks - Average USD Fair Value Measurements for Contracts Rates (Details) Details 65 false false R66.htm 065 - Disclosure - Note 9 - Income Taxes (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-9-income-taxes-details-textual Note 9 - Income Taxes (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-9-income-taxes-tables 66 false false R67.htm 066 - Disclosure - Note 9 - Income Taxes - Components of Income Tax Expense (Details) Sheet http://www.smtc.com/20191229/role/statement-note-9-income-taxes-components-of-income-tax-expense-details Note 9 - Income Taxes - Components of Income Tax Expense (Details) Details 67 false false R68.htm 067 - Disclosure - Note 9 - Income Taxes - Income Tax Rate Reconciliation (Details) Sheet http://www.smtc.com/20191229/role/statement-note-9-income-taxes-income-tax-rate-reconciliation-details Note 9 - Income Taxes - Income Tax Rate Reconciliation (Details) Details 68 false false R69.htm 068 - Disclosure - Note 9 - Income Taxes - Income (Loss) Before Income Taxes (Details) Sheet http://www.smtc.com/20191229/role/statement-note-9-income-taxes-income-loss-before-income-taxes-details Note 9 - Income Taxes - Income (Loss) Before Income Taxes (Details) Details 69 false false R70.htm 069 - Disclosure - Note 9 - Income Taxes - Deferred Income Tax Liabilities and Assets (Details) Sheet http://www.smtc.com/20191229/role/statement-note-9-income-taxes-deferred-income-tax-liabilities-and-assets-details Note 9 - Income Taxes - Deferred Income Tax Liabilities and Assets (Details) Details 70 false false R71.htm 070 - Disclosure - Note 10 - Loss Per Share (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-10-loss-per-share-details-textual Note 10 - Loss Per Share (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-10-loss-per-share-tables 71 false false R72.htm 071 - Disclosure - Note 10 - Loss Per Share - Common Shares Outstanding for Basic and Diluted Earnings Per Share (Details) Sheet http://www.smtc.com/20191229/role/statement-note-10-loss-per-share-common-shares-outstanding-for-basic-and-diluted-earnings-per-share-details Note 10 - Loss Per Share - Common Shares Outstanding for Basic and Diluted Earnings Per Share (Details) Details 72 false false R73.htm 072 - Disclosure - Note 11 - Segmented Information (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-11-segmented-information-details-textual Note 11 - Segmented Information (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-11-segmented-information-tables 73 false false R74.htm 073 - Disclosure - Note 11 - Segmented Information - Segment Reporting Information, by Segment (Details) Sheet http://www.smtc.com/20191229/role/statement-note-11-segmented-information-segment-reporting-information-by-segment-details Note 11 - Segmented Information - Segment Reporting Information, by Segment (Details) Details 74 false false R75.htm 074 - Disclosure - Note 11 - Segmented Information - Long-lived Assets in Individual Geographic Areas (Details) Sheet http://www.smtc.com/20191229/role/statement-note-11-segmented-information-longlived-assets-in-individual-geographic-areas-details Note 11 - Segmented Information - Long-lived Assets in Individual Geographic Areas (Details) Details 75 false false R76.htm 075 - Disclosure - Note 12 - Commitments and Contingencies (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-12-commitments-and-contingencies-details-textual Note 12 - Commitments and Contingencies (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-12-commitments-and-contingencies 76 false false R77.htm 076 - Disclosure - Note 13 - Defined Contribution Pension Plan and Post-employment Benefit Plan (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-13-defined-contribution-pension-plan-and-postemployment-benefit-plan-details-textual Note 13 - Defined Contribution Pension Plan and Post-employment Benefit Plan (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-13-defined-contribution-pension-plan-and-postemployment-benefit-plan 77 false false R78.htm 077 - Disclosure - Note 14 - Restructuring Charges (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-14-restructuring-charges-details-textual Note 14 - Restructuring Charges (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-14-restructuring-charges-tables 78 false false R79.htm 078 - Disclosure - Note 14 - Restructuring Charges - Restructuring Charges (Details) Sheet http://www.smtc.com/20191229/role/statement-note-14-restructuring-charges-restructuring-charges-details Note 14 - Restructuring Charges - Restructuring Charges (Details) Details 79 false false R80.htm 079 - Disclosure - Note 14 - Restructuring Charges - Restructuring Liability (Details) Sheet http://www.smtc.com/20191229/role/statement-note-14-restructuring-charges-restructuring-liability-details Note 14 - Restructuring Charges - Restructuring Liability (Details) Details 80 false false R81.htm 080 - Disclosure - Note 15 - Related Party Transactions (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-15-related-party-transactions-details-textual Note 15 - Related Party Transactions (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-15-related-party-transactions 81 false false R82.htm 081 - Disclosure - Note 16 - Acquisition of MC Assembly (Details Textual) Sheet http://www.smtc.com/20191229/role/statement-note-16-acquisition-of-mc-assembly-details-textual Note 16 - Acquisition of MC Assembly (Details Textual) Details http://www.smtc.com/20191229/role/statement-note-16-acquisition-of-mc-assembly-tables 82 false false R83.htm 082 - Disclosure - Note 16 - Acquisition of MC Assembly - Fair Value of Purchase Price Consideration (Details) Sheet http://www.smtc.com/20191229/role/statement-note-16-acquisition-of-mc-assembly-fair-value-of-purchase-price-consideration-details Note 16 - Acquisition of MC Assembly - Fair Value of Purchase Price Consideration (Details) Details 83 false false R84.htm 083 - Disclosure - Note 16 - Acquisition of MC Assembly - Fair Value of Acquired Assets and Liabilities (Details) Sheet http://www.smtc.com/20191229/role/statement-note-16-acquisition-of-mc-assembly-fair-value-of-acquired-assets-and-liabilities-details Note 16 - Acquisition of MC Assembly - Fair Value of Acquired Assets and Liabilities (Details) Details 84 false false R85.htm 084 - Disclosure - Note 16 - Acquisition of MC Assembly - Intangible Assets and Useful Lives (Details) Sheet http://www.smtc.com/20191229/role/statement-note-16-acquisition-of-mc-assembly-intangible-assets-and-useful-lives-details Note 16 - Acquisition of MC Assembly - Intangible Assets and Useful Lives (Details) Details 85 false false R86.htm 085 - Disclosure - Note 16 - Acquisition of MC Assembly - Select Financial Results (Details) Sheet http://www.smtc.com/20191229/role/statement-note-16-acquisition-of-mc-assembly-select-financial-results-details Note 16 - Acquisition of MC Assembly - Select Financial Results (Details) Details 86 false false R87.htm 086 - Disclosure - Note 16 - Acquisition of MC Assembly - Pro Forma Financial Results (Details) Sheet http://www.smtc.com/20191229/role/statement-note-16-acquisition-of-mc-assembly-pro-forma-financial-results-details Note 16 - Acquisition of MC Assembly - Pro Forma Financial Results (Details) Details 87 false false All Reports Book All Reports smtx-20191229.xml smtx-20191229.xsd smtx-20191229_cal.xml smtx-20191229_def.xml smtx-20191229_lab.xml smtx-20191229_pre.xml http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/srt/2019-01-31 http://xbrl.sec.gov/country/2017-01-31 http://fasb.org/us-gaap/2019-01-31 true true