Condensed Consolidated Income Statements (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Net sales	$ 731,904	$ 733,605
Cost of goods sold	655,405	659,565
Gross profit	76,499	74,040
Selling, general and administrative expenses	47,540	47,061
Change in fair value of contingent consideration	738	764
Operating income	28,221	26,215
Interest expense	247	124
Interest income	(574)	(633)
Other (income) expense, net	109	(15)
Income before income taxes	28,439	26,739
Provision for income taxes	9,002	9,097
Net income	$ 19,437	$ 17,642
Per share data:
Weighted-average shares outstanding, basic (in shares)	28,034	27,618
Net income per common share, basic (in dollars per share)	$ 0.69	$ 0.64
Weighted-average shares outstanding, diluted (in shares)	28,257	27,901
Net income per common share, diluted (in dollars per share)	$ 0.69	$ 0.63