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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

X

- 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

X

- 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

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 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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