Fair Value Measurements - Additional Information (Detail) € in Millions, $ in Millions					12 Months Ended
	Jun. 10, 2015 USD ($)	Feb. 26, 2015 USD ($)	Oct. 17, 2013 USD ($)	Oct. 17, 2013 EUR (€)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability						$ 6.8
Payment towards contingent consideration liability					$ 3.5
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					3.3
TowerSec Ltd. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability					27.7
Red Bend Ltd. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability		$ 20.9			18.4	16.7
Contingent consideration liability					30.0
Red Bend Ltd. [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					1.1
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					2.8
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	$ 3.0				3.0
Contingent consideration liability					10.0
Southern Vision Systems Inc [Member] | Previously Reported [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability						0.0
Duran Audio BV [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability			$ 0.9	€ 0.7	1.6
Payment towards contingent consideration liability					0.3	0.3
Duran Audio BV [Member] | Previously Reported [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimate fair value of contingent consideration liability						2.2
Duran Audio BV [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					0.3
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
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						$ 5.8
Symphony Teleca Corporation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment towards contingent consideration liability					23.3
Interest accretion recorded to increase liability					1.1
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					$ 3.1