CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 145,796	$ 124,830	$ 400,364	$ 370,599
Cost of sales	109,198	99,867	306,096	284,918
Gross profit	36,598	24,963	94,268	85,681
Selling, general and administrative expenses	19,067	16,381	56,320	47,212
Research and development expenses	2,101	1,504	3,223	3,232
Operating income	15,430	7,078	34,725	35,237
Other (expense) income:
Interest expense	(952)	(310)	(2,993)	(1,200)
Interest and other income, net	(852)	1,136	24	2,171
Other (expense) income, Total	(1,804)	826	(2,969)	971
Income before income taxes	13,626	7,904	31,756	36,208
Income tax provision	5,215	2,548	11,909	12,762
Net income	$ 8,411	$ 5,356	$ 19,847	$ 23,446
Net income per common share (in dollars per share)	$ 0.29	$ 0.19	$ 0.69	$ 0.84
Diluted net income per common share (in dollars per share)	$ 0.29	$ 0.19	$ 0.68	$ 0.82
Weighted average shares outstanding:
Basic (in shares)	28,773	28,087	28,710	27,888
Diluted (in shares)	29,267	28,606	29,216	28,470