Business Segment Information Reconciliation of Operating Profit by Segment to Consolidated (Details) - USD ($) $ 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
REVENUE
License	$ 326	$ 516	$ 849	$ 694	$ 511	$ 292	$ 634	$ 1,604	$ 2,385	$ 3,041	$ 2,635
Support and service	371,008	342,769	337,515	333,046	353,364	319,649	320,219	307,746	1,384,338	1,300,978	1,200,652
Hardware	12,435	10,482	10,189	11,288	13,095	13,245	12,019	12,268	44,394	50,627	52,903
Total revenue	383,769	353,767	348,553	345,028	366,970	333,186	332,872	321,618	1,431,117	1,354,646	1,256,190
COST OF SALES
Cost of license	139	280	59	252	325	193	498	181	730	1,197	1,187
Cost of support and service	210,138	198,844	191,269	185,892	195,878	184,527	181,989	174,714	786,143	737,108	680,750
Cost of hardware	9,121	7,603	6,818	8,619	9,067	9,553	7,958	8,768	32,161	35,346	38,399
Total cost of sales	219,398	206,727	198,146	194,763	205,270	194,273	190,445	183,663	819,034	773,651	720,336
GROSS PROFIT	164,371	147,040	150,407	150,265	161,700	138,913	142,427	137,955	612,083	580,995	535,854
OPERATING EXPENSES	65,423	58,309	61,801	58,848	45,195	59,083	57,640	57,418	244,381	219,336	217,989
INTEREST INCOME (EXPENSE)	(354)	(236)	(124)	(34)	(399)	(432)	(185)	(107)	(748)	(1,123)	(1,425)
INCOME BEFORE INCOME TAXES	$ 98,594	$ 88,495	$ 88,482	$ 91,383	$ 116,106	$ 79,398	$ 84,602	$ 80,430	366,954	360,536	316,440
Bank Systems and Services [Member]
REVENUE
License									1,928	2,536	1,727
Support and service									1,025,378	960,738	922,545
Hardware									28,457	33,394	38,457
Total revenue									1,055,763	996,668	962,729
COST OF SALES
Cost of license									627	1,058	832
Cost of support and service									605,414	564,851	533,407
Cost of hardware									20,281	23,159	27,831
Total cost of sales									626,322	589,068	562,070
GROSS PROFIT									429,441	407,600	400,659
Credit Union Systems and Services [Member]
REVENUE
License									457	505	908
Support and service									358,960	340,240	278,107
Hardware									15,937	17,233	14,446
Total revenue									375,354	357,978	293,461
COST OF SALES
Cost of license									103	139	355
Cost of support and service									180,729	172,257	147,343
Cost of hardware									11,880	12,187	10,568
Total cost of sales									192,712	184,583	158,266
GROSS PROFIT									$ 182,642	$ 173,395	$ 135,195