Quarterly Financial Data (Unaudited) (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 Data [Abstract]
Net sales	$ 524,270	$ 532,721	$ 638,964	$ 519,618	$ 573,594	$ 471,225	$ 503,014	$ 443,322	$ 2,215,573	$ 1,991,155	$ 1,467,202
Gross profit	73,796	79,152	106,362	72,215	89,766	76,820	84,452	69,193	331,525	320,231	225,545
Net income	$ 6,971	$ 16,662	$ 34,689	$ 13,699	$ 26,702	$ 23,056	$ 31,242	$ 20,863	$ 72,021	$ 101,863	$ 54,157
Net income per common share:
Basic (in dollars per share)	$ 0.14	$ 0.35	$ 0.73	$ 0.29	$ 0.56	$ 0.49	$ 0.68	$ 0.46	$ 1.50	$ 2.19	$ 1.24
Diluted (in dollars per share)	$ 0.13	$ 0.32	$ 0.67	$ 0.27	$ 0.51	$ 0.44	$ 0.61	$ 0.42	$ 1.39	$ 2.03	$ 1.16