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Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Net revenues $ 321,075 $ 294,746 $ 281,470 $ 261,503 $ 273,717 $ 244,987 $ 231,822 $ 221,520 $ 1,158,794 $ 972,046 $ 827,216
Cost of goods sold 193,580 176,361 172,037 155,528 164,939 147,277 137,559 133,918 697,506 583,693 514,403
Internal research and development 33,346 30,560 27,764 25,574 25,966 25,380 23,632 21,832 117,244 96,810 60,354
Selling, general and administrative 55,924 53,087 49,122 50,624 47,137 43,291 43,495 42,079 208,757 176,002 160,646
Interest expense 5,049 5,014 4,644 3,645 2,262 1,936 1,365 1,246 18,352 6,809 3,081
Other expense (income), net (1,031) (1,496) (1,965) (767) (445) (2,164) (6,045) (1,402) (5,259) (10,056) (1,223)
Earnings Before Income Taxes 34,207 31,220 29,868 26,899 33,858 29,267 31,816 23,847 122,194 118,788 89,955
Income taxes 7,040 1,122 20,272 5,758 1,211 6,837 7,913 7,553 34,192 23,514 24,469
Net Earnings $ 27,167 $ 30,098 $ 9,596 $ 21,141 $ 32,647 $ 22,430 $ 23,903 $ 16,294 $ 88,002 $ 95,274 $ 65,486
Basic earnings per share $ 0.44 $ 0.48 $ 0.15 $ 0.34 $ 0.52 $ 0.36 $ 0.38 $ 0.26 $ 1.41 $ 1.52 $ 1.07
Diluted earnings per share $ 0.42 $ 0.45 $ 0.15 $ 0.32 $ 0.50 $ 0.35 $ 0.37 $ 0.26 $ 1.35 $ 1.48 $ 1.04