Quarterly Financial Data (Unaudited) (Schedule of Quarterly 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	$ 725,085	$ 706,563	$ 739,999	$ 681,464	$ 737,547	$ 736,663	$ 743,437	$ 667,727	$ 2,853,111	$ 2,885,374	$ 2,609,613
Gross profit	149,719	143,393	138,393	109,867	150,081	159,908	166,261	137,881	541,372	614,131	562,855
Operating income (loss)	8,587	47,067	41,400	13,751	(65,138)	71,148	90,078	54,272	110,805	150,360	233,862
Income/(loss) before income taxes and equity in earnings of equity-method investees	2,749	39,556	37,656	9,182	(77,572)	72,863	80,713	42,404	89,143	118,408	212,869
Net income (loss)	$ 313	$ 31,328	$ 27,185	$ 8,604	$ (88,597)	$ 48,788	$ 58,080	$ 29,158	$ 67,430	$ 47,429	$ 164,962
Net income (loss) per common share:
Basic (USD per share)	$ 0.00	$ 0.30	$ 0.26	$ 0.08	$ (0.86)	$ 0.47	$ 0.56	$ 0.28	$ 0.65	$ 0.46	$ 1.62
Diluted (USD per share)	$ 0.00	$ 0.30	$ 0.26	$ 0.08	$ (0.86)	$ 0.47	$ 0.56	$ 0.28	$ 0.65	$ 0.46	$ 1.60