Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Net revenues	$ 273,717	$ 244,987	$ 231,822	$ 221,520	$ 241,470	$ 205,105	$ 191,434	$ 189,207	$ 972,046	$ 827,216	$ 741,961
Cost of goods sold	164,939	147,277	137,559	133,918	148,859	127,436	120,090	118,018	583,693	514,403	470,363
Internal research and development	25,966	25,380	23,632	21,832	20,102	14,946	12,155	13,151	96,810	60,354	51,260
Selling, general and administrative	47,137	43,291	43,495	42,079	43,595	43,333	37,408	36,310	176,002	160,646	143,539
Interest expense	2,262	1,936	1,365	1,246	1,066	769	597	649	6,809	3,081	3,863
Other expense (income), net	(445)	(2,164)	(6,045)	(1,402)	(429)	1,257	(994)	(1,057)	(10,056)	(1,223)	(6,176)
Earnings Before Income Taxes	33,858	29,267	31,816	23,847	28,277	17,364	22,178	22,136	118,788	89,955	79,112
Income taxes	1,211	6,837	7,913	7,553	13,934	2,426	3,187	4,922	23,514	24,469	13,137
Net Earnings	$ 32,647	$ 22,430	$ 23,903	$ 16,294	$ 14,343	$ 14,938	$ 18,991	$ 17,214	$ 95,274	$ 65,486	$ 65,975
Basic earnings per share	$ 0.52	$ 0.36	$ 0.38	$ 0.26	$ 0.23	$ 0.24	$ 0.31	$ 0.28	$ 1.52	$ 1.07	$ 1.08
Diluted earnings per share	$ 0.50	$ 0.35	$ 0.37	$ 0.26	$ 0.23	$ 0.24	$ 0.30	$ 0.27	$ 1.48	$ 1.04	$ 1.05