Quarterly Financial Data (Unaudited) - Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 132,582	$ 132,507	$ 144,809	$ 135,984	$ 130,197	$ 125,525	$ 143,129	$ 129,529	$ 545,882	$ 528,380	$ 513,869
Gross profit	49,204	46,569	53,142	48,121	45,483	48,052	54,374	48,005	197,036	195,914	185,176
Income (loss) from operations	(1,417)	(1,405)	3,505	2,601	2,327	(2,075)	5,650	3,014	3,284	8,916	372
Net income (loss)	$ (2,187)	$ (2,572)	$ 2,896	$ 2,515	$ 3,111	$ 2,506	$ 4,709	$ 1,806	$ 652	$ 12,132	$ (8,462)
Net income (loss) per common share - basic (in US$ per share)	$ (0.13)	$ (0.16)	$ 0.18	$ 0.16	$ 0.19	$ 0.16	$ 0.30	$ 0.11	$ 0.04	$ 0.76	$ (0.54)
Net income (loss) per common share - diluted (in US$ per share)	$ (0.13)	$ (0.16)	$ 0.18	$ 0.16	$ 0.19	$ 0.16	$ 0.29	$ 0.11	$ 0.04	$ 0.76	$ (0.54)