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, 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	Jun. 30, 2013	Feb. 28, 2013
Business Acquisition [Line Items]
Goodwill	$ 1,287,180							$ 540,952				$ 234,342
Southern Vision Systems Inc [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 2,134
Accounts receivable		1,510
Inventories		911
Other current assets		50
Current assets		4,605
Property, plant and equipment		177
Goodwill		13,165
Intangibles		8,360
Total assets		26,307
Accounts payable		513
Accrued liabilities		494
Total current liabilities		1,007
Other non-current liabilities		3,351
Total liabilities		4,358
Net assets		$ 21,949
Bang & Olufsen [Member]
Business Acquisition [Line Items]
Accounts receivable			$ 9,338
Inventories			5,699
Other current assets			1,759
Current assets			16,796
Property, plant and equipment			7,065
Goodwill			13,202
Intangibles			129,700
Total assets			166,763
Accrued liabilities			1,046
Total current liabilities			1,046
Total liabilities			1,046
Net assets			$ 165,717
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				529,367
Intangibles				317,900
Other assets				33,479
Total assets				1,078,371
Short-term debt				13,417
Accounts payable				4,469
Accrued liabilities				47,437
Non-controlling interest				17,461
Total current liabilities				65,323
Total liabilities and equity				332,698
Other non-current liabilities				129,067
Long-term debt				120,847
Total liabilities				315,237
Net assets				$ 745,673
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					187,031
Intangibles					50,300
Other assets					4,934
Total assets					249,179
Short-term debt					1,715
Accounts payable					833
Accrued liabilities					15,727
Total current liabilities					18,275
Other non-current liabilities					18,877
Total liabilities					37,152
Net assets					$ 212,027
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 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]
Business Acquisition [Line Items]
Goodwill							$ 7,958
Intangibles							3,830
Total assets							11,788
Other non-current liabilities							1,071
Total liabilities							1,071
Net assets							$ 10,717
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 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
Martin Professional A/S [Member]
Business Acquisition [Line Items]
Cash and cash equivalents													$ 2,140
Accounts receivable													25,392
Inventories													41,104
Deferred taxes, current													8,016
Other current assets													5,187
Current assets													81,839
Property, plant and equipment													9,421
Goodwill													61,557
Investments in unconsolidated subsidiaries													1,932
Intangibles													36,299
Other assets													1,574
Total assets													192,622
Current portion of long-term debt													2,389
Short-term debt													39,061
Accounts payable													11,401
Accrued liabilities													31,052
Income taxes payable													975
Total current liabilities													84,878
Deferred tax liabilities, long-term													7,885
Long-term debt													9,080
Total liabilities													101,843
Net assets													$ 90,779