XML 61 R53.htm IDEA: XBRL DOCUMENT
v3.25.3

Debt and Other Borrowings - Additional Information (Details) |  |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2025 USD ($) | May 30, 2025 USD ($) | Apr. 30, 2025 USD ($) | Feb. 06, 2025 USD ($) | Jun. 21, 2023 USD ($) | Sep. 26, 2025 USD ($) | Aug. 06, 2024 USD ($)
Letter of Credit | Minimum | SOFR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.50% |
Letter of Credit | Maximum | SOFR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.75% |
2025 Refinancing and Repricing of Refinanced 2023 Term Loan Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 375,000,000 |  |  |
Amortization rate per quarter |  |  |  | 0.00% |  |  |
Maturity date |  |  |  | Oct. 31, 2030 |  |  |
Incurred fees amount |  |  |  | $ 1,090,000 |  |  |
Payment applied to the term loan balance | $ 25,000,000 | $ 10,000,000 | $ 25,000,000 |  |  |  |
2025 Refinancing and Repricing of Refinanced 2023 Term Loan Facility | SOFR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.00% |  |  |
2025 Refinancing and Repricing of Refinanced 2023 Term Loan Facility | Fed Fund Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.50% |  |  |
2025 Refinancing and Repricing of Refinanced 2023 Term Loan Facility | One- Month SOFR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.00% |  |  |
2025 Refinancing and Repricing of Refinanced 2023 Term Loan Facility | Maximum | One- Month SOFR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.00% |  |  |
Senior Secured Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  | 0.045 |
Senior Secured Revolving Credit Facility | Morgan Stanley Senior Funding, Inc |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 224,000,000 |  | $ 256,000,000
Maturity date |  |  |  |  | Jun. 21, 2028 |  |
Outstanding balance |  |  |  |  |  | $ 0 |
Senior Secured Revolving Credit Facility | Letter of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  | 0.04 |
Preliminary purchase price |  |  |  |  |  | $ 500,000,000 |
Terminate percentage |  |  |  |  |  | 0.50 |
Senior Secured Revolving Credit Facility | Letter of Credit | Fed Fund Rate |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.50% |
Senior Secured Revolving Credit Facility | Letter of Credit | One- Month SOFR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.00% |
Senior Secured Revolving Credit Facility | Letter of Credit | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  | 0.20% |
Senior Secured Revolving Credit Facility | Letter of Credit | Minimum | One- Month SOFR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.50% |
Senior Secured Revolving Credit Facility | Letter of Credit | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  | 0.25% |
Senior Secured Revolving Credit Facility | Letter of Credit | Maximum | One- Month SOFR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.75% |
Senior Secured Revolving Credit Facility | Letter of Credit | Morgan Stanley Senior Funding, Inc |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 20,000,000 |  |
Refinanced 2023 Term Loan Facility | Morgan Stanley Senior Funding, Inc |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 400,000,000

X
- Definition Debt instrument amortization rate. + References No definition available. + Details
Name: | algm_DebtInstrumentAmortizationRate
Namespace Prefix: | algm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Covenant, Leverage Ratio, Maximum + References No definition available. + Details
Name: | algm_DebtInstrumentCovenantLeverageRatioMaximum
Namespace Prefix: | algm_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument Loans and Commitments Terminate Percentage + References No definition available. + Details
Name: | algm_DebtInstrumentLoansAndCommitmentsTerminatePercentage
Namespace Prefix: | algm_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Payments to term loan. + References No definition available. + Details
Name: | algm_PaymentsToTermLoan
Namespace Prefix: | algm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-8 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479303/805-10-55-41 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DebtInstrumentFeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 + Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=algm_TwoThousandTwentyFiveRefinancingAndRepricingOfRefinancedTwoThousandTwentyThreeTermLoanFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=algm_OneMonthSecuredOvernightFinancingRateSOFROvernightIndexSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=algm_MorganStanleySeniorFundingIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=algm_RefinancedTwoThousandAndTwentyThreeTermLoanFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |