CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ 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
REVENUE
REVENUE	$ 417,229	$ 384,684	$ 374,756	$ 359,934	$ 383,769	$ 353,767	$ 348,553	$ 345,028	$ 1,536,603	$ 1,431,117	$ 1,354,646
OPERATING EXPENSES
Cost of Revenue	235,682	221,592	211,653	204,715	219,398	206,727	198,146	194,763	873,642	819,034	773,651
Research and Development	24,406	22,591	22,414	20,929	23,340	20,801	20,873	19,739	90,340	84,753	81,234
Selling, General and Administrative	48,615	44,185	45,613	43,733	43,103	39,794	40,892	39,109	182,146	162,898	157,593
Gain on Disposal of Businesses	0	0	(189)	(1,705)	(1,020)	(2,286)	36	0	(1,894)	(3,270)	(19,491)
Total Expenses	308,703	288,368	279,491	267,672	284,821	265,036	259,947	253,611	1,144,234	1,063,415	992,987
OPERATING INCOME	108,526	96,316	95,265	92,262	98,948	88,731	88,606	91,417	392,369	367,702	361,659
INTEREST INCOME (EXPENSE)
Interest Income	152	130	146	147	38	42	60	108	575	248	307
Interest Expense	(747)	(734)	(250)	(189)	(392)	(278)	(184)	(142)	(1,920)	(996)	(1,430)
Total Interest Income (Expense)	(595)	(604)	(104)	(42)	(354)	(236)	(124)	(34)	(1,345)	(748)	(1,123)
INCOME BEFORE INCOME TAXES	107,931	95,712	95,161	92,220	98,594	88,495	88,482	91,383	391,024	366,954	360,536
PROVISION FOR INCOME TAXES	22,651	23,317	(60,413)	28,809	33,903	28,451	29,668	29,139	14,364	121,161	111,669
NET INCOME	$ 85,280	$ 72,395	$ 155,574	$ 63,411	$ 64,691	$ 60,044	$ 58,814	$ 62,244	$ 376,660	$ 245,793	$ 248,867
Earnings Per Share
Basic earnings per share	$ 1.10	$ 0.94	$ 2.01	$ 0.82	$ 0.83	$ 0.77	$ 0.76	$ 0.79	$ 4.88	$ 3.16	$ 3.13
Basic weighted average shares outstanding	77,261	77,247	77,218	77,283	77,602	77,597	77,814	78,413	77,252	77,856	79,416
Diluted earnings per share	$ 1.10	$ 0.93	$ 2.01	$ 0.82	$ 0.83	$ 0.77	$ 0.75	$ 0.79	$ 4.85	$ 3.14	$ 3.12
Diluted weighted average shares outstanding	77,585	77,546	77,565	77,646	78,064	77,932	78,180	78,844	77,585	78,255	79,734