Commitments and Contingencies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Jan. 14, 2008
Commitments And Contingencies Disclosure [Abstract]
Adverse effect on earnings per share resulting from changing sales forecasts			$ 1.00
Gains related to contingency	$ 3.9	$ 3.9
Costs relating to delayed delivery of product	$ 0.9	$ 0.9

Adverse effect on earnings per share resulting from changing sales forecasts.

No definition available.

Name:	har_AdverseEffectOnEarningsPerShareResultingFromChangingSalesForecasts
Namespace Prefix:	har_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant