Unaudited Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, 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
Quarterly Financial Information Disclosure [Abstract]
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
Net income	$ 5,402	$ 7,593	$ 4,513	$ 4,820	$ 3,981	$ 5,379	$ 4,588	$ 3,033	$ 22,328	$ 16,981	$ 8,968
Net income (loss) per diluted share	$ 0.19	$ 0.28	$ 0.17	$ 0.18	$ 0.15	$ 0.20	$ 0.17	$ 0.11	$ 0.81	$ 0.63	$ 0.34