Selected Quarterly Financial Data (Unaudited) - Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 134,162	$ 134,468	$ 142,307	$ 133,445	$ 132,582	$ 132,507	$ 144,809	$ 135,984	$ 544,382	$ 545,882	$ 528,380
Gross profit	52,428	52,560	52,908	50,579	49,204	46,569	53,142	48,121	208,475	197,036	195,914
Income (loss) from operations	3,075	306	5,361	(563)	(1,417)	(1,405)	3,505	2,601	8,179	3,284	8,916
Net income (loss)	$ 84,239	$ 1,192	$ 5,561	$ (1,074)	$ (2,187)	$ (2,572)	$ 2,896	$ 2,515	$ 89,918	$ 652	$ 12,132
Net income (loss) per common share - basic (in US$ per share)	$ 5.09	$ 0.07	$ 0.34	$ (0.07)	$ (0.13)	$ (0.16)	$ 0.18	$ 0.16	$ 5.45	$ 0.04	$ 0.76
Net income (loss) per common share - diluted (in US$ per share)	$ 5.05	$ 0.07	$ 0.34	$ (0.07)	$ (0.13)	$ (0.16)	$ 0.18	$ 0.16	$ 5.41	$ 0.04	$ 0.76