Unaudited Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Jun. 30, 2015		Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 146,587		$ 145,796	$ 123,765	$ 130,803	$ 139,580	$ 124,830	$ 116,508	$ 129,261	$ 546,951	$ 510,179	$ 499,690
Gross profit	41,166		36,598	30,019	27,651	29,022	24,963	26,984	33,734	135,434	114,703	98,271
Net income	$ 13,636	[1]	$ 8,411	$ 6,608	$ 4,828	$ 5,554	$ 5,356	$ 6,755	$ 11,335	$ 33,483	$ 29,000	$ 22,328
Net income (loss) per diluted share	$ 0.46	[1]	$ 0.29	$ 0.23	$ 0.17	$ 0.19	$ 0.19	$ 0.24	$ 0.4	$ 1.14	$ 1.02	$ 0.81

[1] Includes pretax items consisting of $1,618 environmental remediation charge in connection with Arsynco, $3,468 reversal of contingent consideration related to the PACK acquisition and $3,497 change in estimate for product returns.