Balance Sheet (Details Textual)	Jun. 29, 2012
Balance Sheet (Textual) [Abstract]
Percentage of Net Account Receivable accounted by Customer	11.00%

Percentage of Net Account Receivable accounted by Customer.

No definition available.

Name:	hlit_PercentageOfNetAccountReceivableAccountedByCustomer
Namespace Prefix:	hlit_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant