Accounts Payable - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Jun. 30, 2016
Accounts Payable Current And Noncurrent [Abstract]
Payment obligations placed in accounts payable tracking system	$ 253.5	$ 316.6
Accounts payable sold by participating suppliers to participating financial institutions	$ 103.7	$ 149.6

Accounts payable sold by participating suppliers to participating financial institutions.

No definition available.

Name:	har_AccountsPayableSoldByParticipatingSuppliersToParticipatingFinancialInstitutions
Namespace Prefix:	har_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant