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ACCOUNTS RECEIVABLE - Narrative (Details) - JPMorgan Chase Bank - USD ($) | 16 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aggregate amount |  | $ 30,000,000
Aggregate amount outstanding | $ 0 |

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- Definition Receivable Purchase Agreement, Amount Sold + References No definition available. + Details
Name: | hlit_ReceivablePurchaseAgreementAmountSold
Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Receivable Purchase Agreement, Maximum Amount + References No definition available. + Details
Name: | hlit_ReceivablePurchaseAgreementMaximumAmount
Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_CounterpartyNameAxis=hlit_JPMorganChaseBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |