Fair Value Measurements - Additional Information (Detail) - USD ($)			3 Months Ended
	Jun. 10, 2015	Feb. 26, 2015	Sep. 30, 2015	Sep. 30, 2014	Apr. 08, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gains or losses recognized			$ 0	$ 0
Red Bend Ltd. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability		$ 16,700,000	16,700,000
Contingent consideration liability			30,000,000
Duran Audio BV [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			1,900,000
Payment towards contingent consideration liability			300,000	$ 0
Yurbuds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			6,800,000
Symphony Teleca Corporation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			25,800,000
Accretion recorded to increase liability			500,000
Contingent consideration liability					$ 24,900,000
Southern Vision Systems Inc [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability	$ 0		0
Contingent consideration liability			10,000,000
IPSG/VFX [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			0
IPSG/VFX [Member] | Previously Reported [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			$ 5,800,000