CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 124,830	$ 150,871	$ 370,599	$ 376,575
Cost of sales	99,867	119,344	284,918	302,835
Gross profit	24,963	31,527	85,681	73,740
Selling, general and administrative expenses	16,381	18,835	47,212	45,767
Research and development expenses	1,504	946	3,232	2,002
Operating income	7,078	11,746	35,237	25,971
Other income (expense):
Interest expense	(310)	(492)	(1,200)	(1,570)
Interest and other income, net	1,136	333	2,171	1,906
Other income (expense)	826	(159)	971	336
Income before income taxes	7,904	11,587	36,208	26,307
Income tax provision	2,548	3,994	12,762	9,381
Net income	$ 5,356	$ 7,593	$ 23,446	$ 16,926
Net income per common share	$ 0.19	$ 0.28	$ 0.84	$ 0.63
Diluted net income per common share	$ 0.19	$ 0.28	$ 0.82	$ 0.62
Weighted average shares outstanding:
Basic	28,087	27,108	27,888	26,956
Diluted	28,606	27,485	28,470	27,342