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Retirement Plans - Defined Contribution Plans, Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 26, 2021 | Mar. 27, 2020
AML US Employee, Defined Contribution Plan |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Maximum employee contribution | 50.00% |
Employer matching contribution | 100.00% |
Maximum employer contribution | 5.00% |
Total contributions | $ 3,687 | $ 3,792
AME Plan |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Total contributions | $ 507 | 372
401(K) Plan |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Maximum employee contribution | 35.00% |
Employer matching contribution | 100.00% |
Maximum employer contribution | 5.00% |
Total contributions |  | $ 1,828
Vesting percentage | 100.00% |
Safe harbor provision, employer contribution | 0.03 |

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- Definition Defined Contribution Plan, Safe Harbor Provision, Employer Matching Contribution, Percent of Employees' Gross Pay + References No definition available. + Details
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Namespace Prefix: | algm_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |