XML 122 R108.htm IDEA: XBRL DOCUMENT
v3.22.1

Common Stock and Stock-Based Compensation - Schedule of Stock Issued in Common Stock Conversion (Details) | Nov. 02, 2020 shares
--- | ---
Conversion of Stock [Line Items] |
Shares issued upon conversion (in shares) | 164,431,766
Common Stock, Class A |
Conversion of Stock [Line Items] |
Shares issued upon conversion (in shares) | 156,155,403
Common Stock, Class L |
Conversion of Stock [Line Items] |
Shares issued upon conversion (in shares) | 8,276,363
Shares Of Common Stock |
Conversion of Stock [Line Items] |
Shares issued upon conversion (in shares) | 163,972,017
Shares Of Common Stock | Common Stock, Class A |
Conversion of Stock [Line Items] |
Shares issued upon conversion (in shares) | 156,155,403
Shares Of Common Stock | Common Stock, Class L |
Conversion of Stock [Line Items] |
Shares issued upon conversion (in shares) | 7,816,614
Shares Of Unvested Restricted Common Stock |
Conversion of Stock [Line Items] |
Shares issued upon conversion (in shares) | 459,749
Shares Of Unvested Restricted Common Stock | Common Stock, Class A |
Conversion of Stock [Line Items] |
Shares issued upon conversion (in shares) | 0
Shares Of Unvested Restricted Common Stock | Common Stock, Class L |
Conversion of Stock [Line Items] |
Shares issued upon conversion (in shares) | 459,749

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ConversionOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 + Details
Name: | us-gaap_ConversionOfStockSharesIssued1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=algm_CommonClassLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConversionOfStockByUniqueDescriptionAxis=algm_SharesOfCommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConversionOfStockByUniqueDescriptionAxis=algm_SharesOfUnvestedRestrictedCommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |