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Goodwill (Detail) (MWM Acoustics [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2011
MWM Acoustics [Member]
Goodwill [Line Items]
Increase in goodwill	$ 79.8

Change in the carrying value of goodwill. The change could be the result of new goodwill acquired, goodwill impairment, if any, goodwill written off related to the sale of a business or other adjustments to goodwill.

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