Segment Information (Schedule of Net Sales and Gross Profit by Source Country) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010		Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Segment Reporting Information [Line Items]
Net sales	$ 110,949	$ 121,415	$ 110,707	$ 101,317	$ 121,204	$ 117,881	$ 85,683	[1]	$ 87,660	$ 444,388	$ 412,428	$ 346,631
Gross profit	20,714	22,155	20,644	18,519	19,996	19,432	13,123	[1]	13,287	82,032	65,838	54,155
United States [Member]
Segment Reporting Information [Line Items]
Net sales										289,630	260,686	216,687
Gross profit										58,733	42,472	33,139
Germany [Member]
Segment Reporting Information [Line Items]
Net sales										82,600	78,044	68,121
Gross profit										14,303	14,353	13,038
Netherlands [Member]
Segment Reporting Information [Line Items]
Net sales										13,738	15,451	14,377
Gross profit										1,706	1,712	1,894
France [Member]
Segment Reporting Information [Line Items]
Net sales										33,143	32,718	24,553
Gross profit										3,885	3,560	2,585
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Net sales										25,277	25,529	22,893
Gross profit										$ 3,405	$ 3,741	$ 3,499

[1] Includes approximate $2,600 tax charge related to the repatriation of earnings from certain foreign subsidiaries, in connection with the acquisition of Rising and approximately $1,060 of transaction costs related to this acquisition.