Subsequent Events - Additional Information (Detail) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		1 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Oct. 31, 2013 Subsequent Event [Member] USD ($)	Oct. 17, 2013 Subsequent Event [Member] Duran Audio BV [Member] USD ($) D	Oct. 17, 2013 Subsequent Event [Member] Duran Audio BV [Member] EUR (€)
Subsequent Event [Line Items]
Declared cash dividend, per share	$ 1.20	$ 0.60	$ 0.30
Dividend payable, date to be paid			Nov. 25, 2013
Dividend payable, date of record			Nov. 11, 2013
Purchase price				$ 24.7	€ 18.0
Number of days for net debt and working capital adjustment				30	30
Number of years expected to occur certain days				1 year 6 months	1 year 6 months
Acquisition earnout				$ 16.4	€ 12.0
Percentage of indemnification holdback				12.00%	12.00%