Selected Quarterly Financial Data (Unaudited) - Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 149,538	$ 157,927	$ 167,366	$ 131,713	$ 133,800	$ 138,187	$ 139,025	$ 130,488	$ 606,544	$ 541,500	$ 544,382
Cost of goods sold	96,939	105,716	111,175	85,672	91,025	88,305	89,531	85,761	399,502	354,622	373,214
Gross profit	52,599	52,211	56,191	46,041	42,775	49,882	49,494	44,727	207,042	186,878	171,168
Selling expenses	41,256	38,041	42,414	32,828	33,230	34,388	32,408	33,303	154,539	133,329	123,260
Income (loss) from operations	2,001	(2,767)	28	1,862	(3,096)	4,109	36,997	1,168	1,124	39,178	(2,190)
Net (loss) income	$ 133	$ (2,193)	$ (17,060)	$ 840	$ (1,837)	$ 2,846	$ 20,728	$ 814	$ (18,280)	$ 22,551	$ 71,791
Net income (loss) per common share - basic (in US$ per share)	$ 0.00	$ (0.14)	$ (1.03)	$ 0.05	$ (0.11)	$ 0.17	$ 1.25	$ 0.05	$ (1.11)	$ 1.35	$ 4.35
Net income (loss) per common share - diluted (in US$ per share)	$ 0.00	$ (0.14)	$ (1.03)	$ 0.05	$ (0.11)	$ 0.17	$ 1.24	$ 0.05	$ (1.11)	$ 1.34	$ 4.32
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales		$ 157,927	$ 167,366	$ 131,713	$ 133,800	$ 138,187	$ 139,025	$ 130,488
Cost of goods sold		99,117	101,847	82,706	80,182	84,367	83,929	79,290
Gross profit		58,810	65,519	49,007	53,618	53,820	55,096	51,198
Selling expenses		44,736	49,328	38,915	39,286	40,377	39,097	38,438
Income (loss) from operations		(2,864)	2,442	(1,258)	1,693	2,058	35,910	2,505
Net (loss) income		$ (3,908)	$ (18,768)	$ (978)	$ 1,112	$ 1,594	$ 20,076	$ 1,618
Net income (loss) per common share - basic (in US$ per share)		$ (0.24)	$ (1.13)	$ (0.06)	$ 0.07	$ 0.10	$ 1.21	$ 0.10
Net income (loss) per common share - diluted (in US$ per share)		$ (0.24)	$ (1.13)	$ (0.06)	$ 0.07	$ 0.10	$ 1.20	$ 0.10