Goodwill and Intangible Assets, Net - Schedule of Intangible Assets, Net (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Dec. 31, 2014
AMX [Member]
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets related to the acquisition	$ 55.7
Martin [Member]
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets related to the acquisition	18.3
Yurbuds [Member]
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets related to the acquisition	$ 3.3