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Agreement to Acquire S1nn GmbH & Co. KG - Additional Information (Detail) (S1nn GmbH & Co. KG [Member])
In Millions, unless otherwise specified
0 Months Ended
Dec. 18, 2014
USD ($)
Dec. 18, 2014
EUR (€)
Business Acquisition [Line Items]    
Purchase consideration, total $ 50.0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= har_SonennGmbhAndCoKgMember
€ 42.0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= har_SonennGmbhAndCoKgMember