Acquisitions - Schedule of Cost of Acquisition, including Fair Value of Contingent Consideration Allocated to Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 30, 2014	Jun. 17, 2014	Jun. 13, 2014
Business Acquisition [Line Items]
Goodwill	$ 530,889	$ 540,952	$ 251,370	$ 234,342
IPSG/VFX [Member]
Business Acquisition [Line Items]
Goodwill					9,263
Intangibles					4,537
Total assets					13,800
Other non-current liabilities					1,098
Total liabilities					1,098
Net assets					12,702
Yurbuds [Member]
Business Acquisition [Line Items]
Accounts receivable, net						9,431
Inventories, net						7,587
Other current assets						486
Current assets						17,504
Property, plant and equipment, net						2,928
Goodwill						31,200
Intangibles						6,400
Total assets						58,032
Accounts payable						9,234
Accrued liabilities						5,500
Total current liabilities						14,734
Total liabilities						14,734
Net assets						43,298
AMX LLC [Member]
Business Acquisition [Line Items]
Cash and cash equivalents							4,351
Accounts receivable, net							27,203
Inventories, net	4,200						29,100
Other current assets							4,877
Current assets							65,531
Property, plant and equipment, net	2,700						28,189
Goodwill							242,909
Intangibles							101,030
Other assets							2,146
Total assets							439,805
Accounts payable							11,834
Accrued liabilities							9,698
Total current liabilities							21,532
Other non-current liabilities							45,674
Total liabilities							67,206
Net assets							$ 372,599