Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Schedule Of Fair Value Measurements [Line Items]
Weighted average cost of capital			19.00%
Discount rate			12.60%
Reduction in contingent consideration	$ 0	$ 0	$ (12,500,000)	$ 0
SG&A [Member]
Schedule Of Fair Value Measurements [Line Items]
Contingent consideration related to acquisition	9,600,000		9,600,000
Reduction in contingent consideration	0		12,500,000
MWM Acoustics [Member]
Schedule Of Fair Value Measurements [Line Items]
Contingent consideration related to acquisition	22,100,000		22,100,000
Interchain [Member]
Schedule Of Fair Value Measurements [Line Items]
Contingent consideration related to earn-out	$ 0		$ 300,000