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Goodwill and Intangible Assets, Net - Additional Information (Detail)
 3 Months Ended 6 Months Ended 0 Months Ended 12 Months Ended 6 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Nov. 05, 2013
Innovative Systems GmbH [Member]
EUR (€)
Jun. 30, 2014
Innovative Systems GmbH [Member]
USD ($)
Dec. 31, 2014
IPSG/VFX [Member]
USD ($)
Dec. 31, 2014
AMX [Member]
USD ($)
Dec. 31, 2014
Yurbuds [Member]
USD ($)
Dec. 31, 2013
Duran [Member]
USD ($)
Goodwill [Line Items]                        
Goodwill $ 530,889,000us-gaap_Goodwill $ 251,370,000us-gaap_Goodwill $ 530,889,000us-gaap_Goodwill $ 251,370,000us-gaap_Goodwill $ 540,952,000us-gaap_Goodwill $ 234,342,000us-gaap_Goodwill            
Increase (decrease) in goodwill     9,190,000us-gaap_GoodwillPeriodIncreaseDecrease 15,929,000us-gaap_GoodwillPeriodIncreaseDecrease         9,200,000us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= har_IpsgAndVfxMember		 (1,100,000)us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= har_AmxMember		 1,100,000us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= har_YurbudsMember		 15,900,000us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= har_DuranAudioBvMember
Goodwill impairment charges 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss                
Dispute settlement amount             16,300,000us-gaap_LitigationSettlementAmount
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= har_InnovativeSystemsGmbhMember		          
Additional contingent purchase price               8,100,000har_ContingentPurchasePriceConsideration
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= har_InnovativeSystemsGmbhMember		        
Net intangible assets 168,500,000us-gaap_IntangibleAssetsNetExcludingGoodwill   168,500,000us-gaap_IntangibleAssetsNetExcludingGoodwill   182,000,000us-gaap_IntangibleAssetsNetExcludingGoodwill              
Amortization expense of intangible assets $ 4,900,000us-gaap_AmortizationOfIntangibleAssets $ 3,400,000us-gaap_AmortizationOfIntangibleAssets $ 11,100,000us-gaap_AmortizationOfIntangibleAssets $ 6,300,000us-gaap_AmortizationOfIntangibleAssets