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, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Net sales	$ 123,115	$ 150,871	$ 113,956	$ 111,748	$ 110,949	$ 121,415	$ 110,707	$ 101,317	$ 499,690	$ 444,388	$ 412,428
Gross profit	24,531	31,527	20,708	21,505	20,714	22,155	20,644	18,519	98,271	82,032	65,838
Reportable Geographical Components [Member] | United States [Member]
Segment Reporting Information [Line Items]
Net sales									326,247	289,630	260,686
Gross profit									68,964	58,733	42,472
Reportable Geographical Components [Member] | Germany [Member]
Segment Reporting Information [Line Items]
Net sales									92,053	82,600	78,044
Gross profit									19,688	14,303	14,353
Reportable Geographical Components [Member] | Netherlands [Member]
Segment Reporting Information [Line Items]
Net sales									14,513	13,738	15,451
Gross profit									1,693	1,706	1,712
Reportable Geographical Components [Member] | France [Member]
Segment Reporting Information [Line Items]
Net sales									38,475	33,143	32,718
Gross profit									4,608	3,885	3,560
Reportable Geographical Components [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales									28,402	25,277	25,529
Gross profit									$ 3,318	$ 3,405	$ 3,741