BALANCE SHEET - Additional Information (Detail)	Sep. 28, 2012
Percentage of net account receivable accounted by customer	10.00%

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