Acquisitions - Schedule of Cost of Acquisition, including Fair Value of Contingent Consideration Allocated to Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 10, 2016	Jun. 30, 2015	Jun. 10, 2015	Jun. 01, 2015	Apr. 08, 2015	Feb. 26, 2015	Feb. 01, 2015	Dec. 30, 2014	Jun. 30, 2014	Jun. 17, 2014	Jun. 13, 2014	Oct. 17, 2013
Business Acquisition [Line Items]
Goodwill	$ 1,510,279		$ 1,287,180							$ 540,952
TowerSec Ltd. [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 472
Other current assets		84
Current assets		556
Property, plant and equipment		205
Goodwill		69,538
Intangibles		4,600
Other non-current assets		89
Total assets		74,988
Accounts payable		119
Accrued liabilities		97
Total current liabilities		216
Other non-current liabilities		3,792
Total liabilities		4,008
Net assets		$ 70,980
Southern Vision Systems Inc [Member]
Business Acquisition [Line Items]
Cash and cash equivalents				$ 2,134
Accounts receivable				1,510
Inventories				855
Other current assets				50
Current assets				4,549
Property, plant and equipment				177
Goodwill				14,718
Intangibles				10,750
Total assets				30,194
Accounts payable				513
Accrued liabilities				464
Total current liabilities				977
Other non-current liabilities				4,202
Total liabilities				5,179
Net assets				$ 25,015
Bang & Olufsen Automotive Assets [Member]
Business Acquisition [Line Items]
Accounts receivable					$ 9,338
Inventories					5,395
Other current assets					1,152
Current assets					15,885
Property, plant and equipment					7,643
Goodwill					12,992
Intangibles					129,700
Total assets					166,220
Accrued liabilities					1,047
Total current liabilities					1,047
Total liabilities					1,047
Net assets					$ 165,173
Symphony Teleca Corporation [Member]
Business Acquisition [Line Items]
Cash and cash equivalents						$ 47,023
Accounts receivable						51,553
Other current assets						74,095
Current assets						172,671
Property, plant and equipment						24,954
Goodwill						598,849
Intangibles						202,900
Other non-current assets						38,011
Total assets						1,037,385
Short-term debt						13,417
Accounts payable						4,469
Accrued liabilities						49,183
Total current liabilities						67,069
Long-term debt						120,847
Other non-current liabilities						87,167
Total liabilities						275,083
Non-controlling interest						17,461
Total liabilities and equity						292,544
Net assets						$ 744,841
Red Bend Ltd. [Member]
Business Acquisition [Line Items]
Cash and cash equivalents							$ 2,401
Accounts receivable							2,007
Other current assets							1,245
Current assets							5,653
Property, plant and equipment							1,261
Goodwill							205,907
Intangibles							30,500
Other non-current assets							4,933
Total assets							248,254
Short-term debt							1,715
Accounts payable							833
Accrued liabilities							15,826
Total current liabilities							18,374
Other non-current liabilities							13,630
Total liabilities							32,004
Net assets							$ 216,250
S1nn GmbH & Co. KG [Member]
Business Acquisition [Line Items]
Cash and cash equivalents								$ 9,497
Accounts receivable								10,772
Inventories								2,975
Other current assets								4,287
Current assets								27,531
Property, plant and equipment								2,627
Goodwill								20,337
Intangibles								25,903
Other non-current assets								3,211
Total assets								79,609
Accounts payable								7,958
Accrued liabilities								15,302
Total current liabilities								23,260
Other non-current liabilities								933
Total liabilities								24,193
Net assets								$ 55,416
IPSG/VFX [Member] | Harman International Industries Pty Ltd [Member]
Business Acquisition [Line Items]
Goodwill									$ 3,640
Intangibles									1,781
Total assets									5,421
Other non-current liabilities									456
Total liabilities									456
Net assets									$ 4,965
Yurbuds [Member]
Business Acquisition [Line Items]
Accounts receivable											$ 9,431
Inventories											4,279
Other current assets											486
Current assets											14,196
Property, plant and equipment											2,198
Goodwill											35,599
Intangibles											4,000
Total assets											55,993
Accounts payable											9,486
Accrued liabilities											2,640
Total current liabilities											12,126
Total liabilities											12,126
Net assets											$ 43,867
AMX LLC [Member]
Business Acquisition [Line Items]
Cash and cash equivalents												$ 4,351
Accounts receivable												27,203
Inventories	4,200											28,781
Other current assets												6,230
Current assets												66,565
Property, plant and equipment	$ 2,700											28,189
Goodwill												242,370
Intangibles												101,030
Other non-current assets												1,487
Total assets												439,641
Accounts payable												11,834
Accrued liabilities												9,535
Total current liabilities												21,369
Other non-current liabilities												45,673
Total liabilities												67,042
Net assets												$ 372,599
Duran Audio BV [Member]
Business Acquisition [Line Items]
Cash and cash equivalents													$ 937
Accounts receivable													1,400
Inventories													2,927
Other current assets													122
Current assets													5,386
Property, plant and equipment													656
Goodwill													15,132
Intangibles													8,545
Total assets													29,719
Accounts payable													334
Accrued liabilities													561
Total current liabilities													895
Other non-current liabilities													2,136
Total liabilities													3,031
Net assets													$ 26,688