Acquisitions - Schedule of Assets and Liabilities Assumed at Fair Values on Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2013 Martin Professional A/S [Member]	Feb. 28, 2013 Martin Professional A/S [Member]	Jul. 22, 2011 MWM Acoustics LLC [Member]
Business Acquisition [Line Items]
Cash and cash equivalents					$ 2,140	$ 1,465
Accounts receivable					23,989	4,434
Purchase price inventories				3,700	46,332	1,062
Deferred taxes, current, net					6,154
Other current assets					5,187	42
Current assets					83,802	7,003
Property, plant and equipment				4,500	9,420	273
Goodwill	234,342	180,811	119,357		56,650	79,757
Investments in unconsolidated subsidiaries					1,932
Intangibles					36,299	20,600
Other noncurrent assets					1,573	1,091
Total assets					189,676	108,724
Current portion of long-term debt					2,389
Short-term debt					39,061
Accounts payable					11,652	5,187
Accrued liabilities					27,855	206
Income taxes payable					975
Total current liabilities					81,932	5,393
Deferred tax liabilities, long-term, net					7,885
Other noncurrent liabilities						1,125
Long-term debt					9,080
Total liabilities					98,897	6,518
Net assets					$ 90,779	$ 102,206