Condensed Consolidated Income Statements (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 791,720	$ 731,904
Cost of goods sold	714,075	655,405
Gross profit	77,645	76,499
Selling, general and administrative expenses	48,155	47,540
Change in fair value of contingent consideration	513	738
Operating income	28,977	28,221
Interest expense	190	247
Interest income	(835)	(574)
Other (income) expense, net	386	109
Income before income taxes	29,236	28,439
Provision for income taxes	10,028	9,002
Net income	$ 19,208	$ 19,437
Per share data:
Weighted-average shares outstanding, basic (in shares)	28,544	28,034
Net income per common share, basic (in dollars per share)	$ 0.67	$ 0.69
Weighted-average shares outstanding, diluted (in shares)	28,794	28,257
Net income per common share, diluted (in dollars per share)	$ 0.67	$ 0.69