Fair Value Measurements - Additional Information (Detail) - USD ($)			3 Months Ended			9 Months Ended
	Jun. 10, 2015	Feb. 26, 2015	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability						$ 6,800,000
Payment towards contingent consideration liability			$ 3,500,000			3,500,000
Gains or losses recognized			0			0
Long-Lived Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gains or losses recognized					$ (2,300,000)		$ (2,300,000)
Selling, General and Administrative Expense [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			3,300,000			3,300,000
TowerSec Ltd. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			20,000,000			20,000,000
Symphony Teleca Corporation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest accretion recorded to increase liability			200,000			1,100,000
Payment towards contingent consideration liability			23,300,000			23,300,000
Symphony Teleca Corporation [Member] | Selling, General and Administrative Expense [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			3,100,000			3,100,000
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			0
Contingent consideration liability			10,000,000			10,000,000
Red Bend Ltd. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability		$ 20,900,000	16,700,000			16,700,000
Contingent consideration liability			30,000,000			30,000,000
Red Bend Ltd. [Member] | Goodwill [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			20,900,000			20,900,000
IPSG/VFX [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			0	$ 0		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
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			1,900,000
Payment towards contingent consideration liability						$ 300,000	$ 300,000