Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
REVENUE
License	$ 511	$ 292	$ 634	$ 1,604	$ 1,072	$ 569	$ 491	$ 503	$ 3,041	$ 2,635	$ 2,184
Support and service	353,364	319,649	320,219	307,746	318,635	296,896	296,905	288,216	1,300,978	1,200,652	1,112,331
Hardware	13,095	13,245	12,019	12,268	14,006	12,244	13,898	12,755	50,627	52,903	58,658
Total revenue	366,970	333,186	332,872	321,618	333,713	309,709	311,294	301,474	1,354,646	1,256,190	1,173,173
COST OF SALES
Cost of license	325	193	498	181	185	285	308	409	1,197	1,187	908
Cost of support and service	195,878	184,527	181,989	174,714	176,826	168,457	170,377	165,090	737,108	680,750	634,756
Cost of hardware	9,067	9,553	7,958	8,768	10,288	9,152	9,574	9,385	35,346	38,399	43,708
Total cost of sales	205,270	194,273	190,445	183,663	187,299	177,894	180,259	174,884	773,651	720,336	679,372
GROSS PROFIT	161,700	138,913	142,427	137,955	146,414	131,815	131,035	126,590	580,995	535,854	493,801
OPERATING EXPENSES
Selling and marketing	23,365	22,732	22,231	21,751	23,492	21,674	22,175	21,663	90,079	89,004	85,443
Research and development	23,964	19,854	18,862	18,554	19,501	17,522	17,681	16,791	81,234	71,495	66,748
General and administrative	17,357	16,497	16,547	17,113	14,049	15,417	18,388	16,510	67,514	64,364	53,312
Gain on disposal of a business	(19,491)	0	0	0	0	0	(6,874)	0	(19,491)	(6,874)	0
Total operating expenses	45,195	59,083	57,640	57,418	57,042	54,613	51,370	54,964	219,336	217,989	205,503
OPERATING INCOME	116,505	79,830	84,787	80,537	89,372	77,202	79,665	71,626	361,659	317,865	288,298
INTEREST INCOME (EXPENSE)
Interest income	49	54	91	113	51	33	28	57	307	169	377
Interest expense	(448)	(486)	(276)	(220)	(322)	(669)	(337)	(266)	(1,430)	(1,594)	(1,105)
Total interest income (expense)	(399)	(432)	(185)	(107)	(271)	(636)	(309)	(209)	(1,123)	(1,425)	(728)
INCOME BEFORE INCOME TAXES	116,106	79,398	84,602	80,430	89,101	76,566	79,356	71,417	360,536	316,440	287,570
PROVISION FOR INCOME TAXES	31,836	25,515	25,254	29,064	28,562	25,854	25,474	25,329	111,669	105,219	100,855
NET INCOME	$ 84,270	$ 53,883	$ 59,348	$ 51,366	$ 60,539	$ 50,712	$ 53,882	$ 46,088	$ 248,867	$ 211,221	$ 186,715
Basic earnings per share	$ 1.07	$ 0.68	$ 0.75	$ 0.64	$ 0.75	$ 0.63	$ 0.66	$ 0.56	$ 3.13	$ 2.60	$ 2.20
Basic weighted average shares outstanding	78,841	78,805	79,473	80,545	80,904	80,880	81,432	82,195	79,416	81,353	84,866
Diluted earnings per share	$ 1.06	$ 0.68	$ 0.74	$ 0.64	$ 0.75	$ 0.63	$ 0.66	$ 0.56	$ 3.12	$ 2.59	$ 2.19
Diluted weighted average shares outstanding	79,261	79,167	79,770	80,735	81,086	81,094	81,634	82,589	79,734	81,601	85,396