XML 128 R102.htm IDEA: XBRL DOCUMENT
v3.19.1

Segment Information - Revenue by Geographic Region (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 27, 2019 | Oct. 28, 2018 | Jul. 29, 2018 | Apr. 29, 2018 | Jan. 28, 2018 | Oct. 29, 2017 | Jul. 30, 2017 | Apr. 30, 2017 | Jan. 27, 2019 | Jan. 28, 2018 | Jan. 29, 2017
Geographic Information And Concentration Of Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 160,006 | $ 173,550 | $ 163,211 | $ 130,429 | $ 140,614 | $ 150,304 | $ 153,127 | $ 143,802 | $ 627,196 | $ 587,847 | $ 544,272
Asia-Pacific |  |  |  |  |  |  |  |  |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 480,680 | 439,342 | 412,167
North America |  |  |  |  |  |  |  |  |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 118,664 | 121,144 | 94,123
Europe |  |  |  |  |  |  |  |  |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 49,353 | 43,580 | 43,378
Other: Warrant Shares |  |  |  |  |  |  |  |  |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales offset |  |  |  |  |  |  |  |  | $ (21,501) | $ (16,219) | $ (5,396)
Net sales revenue |  |  |  |  |  |  |  |  |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Net sales revenue | Asia-Pacific |  |  |  |  |  |  |  |  |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 76.00% | 75.00% | 76.00%
Net sales revenue | North America |  |  |  |  |  |  |  |  |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 19.00% | 21.00% | 17.00%
Net sales revenue | Europe |  |  |  |  |  |  |  |  |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 8.00% | 7.00% | 8.00%
Net sales revenue | Other: Warrant Shares |  |  |  |  |  |  |  |  |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocated share-based compensation expense as a percentage of net revenue |  |  |  |  |  |  |  |  | (3.00%) | (3.00%) | (1.00%)

X
- Definition Allocated share-based compensation expense as a percentage of net revenue + References No definition available. + Details
Name: | smtc_Allocatedsharebasedcompensationexpenseasapercentageofnetrevenue
Namespace Prefix: | smtc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Geographic Information And Concentration Of Risk [Line Items] + References No definition available. + Details
Name: | smtc_GeographicInformationAndConcentrationOfRiskLineItems
Namespace Prefix: | smtc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue Offset + References No definition available. + Details
Name: | smtc_RevenueOffset
Namespace Prefix: | smtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=srt_AsiaPacificMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_NorthAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=smtc_WarrantSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |