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Selected Quarterly Financial Data (Unaudited) - Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 133,800	$ 138,187	$ 139,025	$ 130,488	$ 134,162	$ 134,468	$ 142,307	$ 133,445	$ 541,500	$ 544,382	$ 545,882
Gross profit	53,618	53,820	55,096	51,198	52,428	52,560	52,908	50,579	213,735	208,475	197,036
Income (loss) from operations	1,693	2,058	35,910	2,505	3,075	306	5,361	(563)	42,166	8,179	3,284
Net income	$ 1,112	$ 1,594	$ 20,076	$ 1,618	$ 84,239	$ 1,192	$ 5,561	$ (1,074)	$ 24,400	$ 89,918	$ 652
Net income (loss) per common share - basic (in US$ per share)	$ 0.07	$ 0.10	$ 1.21	$ 0.10	$ 5.09	$ 0.07	$ 0.34	$ (0.07)	$ 1.46	$ 5.45	$ 0.04
Net income (loss) per common share - diluted (in US$ per share)	$ 0.07	$ 0.10	$ 1.20	$ 0.10	$ 5.05	$ 0.07	$ 0.34	$ (0.07)	$ 1.45	$ 5.41	$ 0.04

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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