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, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Net sales	$ 139,580	$ 124,830	$ 116,508	$ 129,261	$ 123,115	$ 150,871	$ 113,956	$ 111,748	$ 510,179	$ 499,690	$ 444,388
Gross profit	29,022	24,963	26,984	33,734	24,531	31,527	20,708	21,505	114,703	98,271	82,032
Geographic region | United States
Segment Reporting Information [Line Items]
Net sales									355,715	326,247	289,630
Gross profit									82,573	68,964	58,733
Geographic region | Germany
Segment Reporting Information [Line Items]
Net sales									84,024	92,053	82,600
Gross profit									22,614	19,688	14,303
Geographic region | Netherlands
Segment Reporting Information [Line Items]
Net sales									14,869	14,513	13,738
Gross profit									1,581	1,693	1,706
Geographic region | France
Segment Reporting Information [Line Items]
Net sales									29,412	38,475	33,143
Gross profit									4,182	4,608	3,885
Geographic region | Asia-Pacific
Segment Reporting Information [Line Items]
Net sales									26,159	28,402	25,277
Gross profit									$ 3,753	$ 3,318	$ 3,405