Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 993,522	$ 807,019	$ 1,864,350	$ 1,598,738
Cost of goods sold	892,889	728,908	1,676,166	1,442,981
Gross profit	100,633	78,111	188,184	155,757
Selling, general and administrative expenses	66,965	51,658	128,510	99,813
Change in fair value of contingent consideration	1,816	463	3,381	976
Operating income	31,852	25,990	56,293	54,968
Interest expense	709	207	990	397
Interest income	(767)	(492)	(1,709)	(1,327)
Other (income) expense, net	278	337	958	724
Income before income taxes	31,632	25,938	56,054	55,174
Provision for income taxes	10,976	9,117	19,402	19,145
Net income	$ 20,656	$ 16,821	$ 36,652	$ 36,029
Per share data:
Net income per common share, basic (in dollars per share)	$ 0.78	$ 0.59	$ 1.35	$ 1.26
Weighted-average shares outstanding, basic (in shares)	26,648	28,579	27,175	28,562
Net income per common share, diluted (in dollars per share)	$ 0.77	$ 0.58	$ 1.34	$ 1.25
Weighted-average shares outstanding, diluted (in shares)	26,902	28,831	27,427	28,813