Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
REVENUE
License	$ 1,072	$ 569	$ 491	$ 503	$ 574	$ 603	$ 245	$ 762	$ 2,635	$ 2,184	$ 5,366
Support and service	318,635	296,896	296,905	288,216	300,359	276,100	273,242	262,630	1,200,652	1,112,331	1,042,801
Hardware	14,006	12,244	13,898	12,755	14,233	14,731	15,356	14,338	52,903	58,658	59,357
Total revenue	333,713	309,709	311,294	301,474	315,166	291,434	288,843	277,730	1,256,190	1,173,173	1,107,524
COST OF SALES
Cost of license	185	285	308	409	148	227	188	345	1,187	908	860
Cost of support and service	176,826	168,457	170,377	165,090	168,007	162,824	154,769	149,156	680,750	634,756	601,620
Cost of hardware	10,288	9,152	9,574	9,385	10,892	11,008	10,867	10,941	38,399	43,708	43,650
Total cost of sales	187,299	177,894	180,259	174,884	179,047	174,059	165,824	160,442	720,336	679,372	646,130
GROSS PROFIT	146,414	131,815	131,035	126,590	136,119	117,375	123,019	117,288	535,854	493,801	461,394
OPERATING EXPENSES
Selling and marketing	23,492	21,674	22,175	21,663	22,483	21,719	20,503	20,738	89,004	85,443	80,811
Research and development	19,501	17,522	17,681	16,791	17,447	17,486	16,142	15,673	71,495	66,748	63,202
General and administrative	14,049	15,417	11,514	16,510	13,301	13,629	12,132	14,250	57,490	53,312	66,624
Total operating expenses	57,042	54,613	51,370	54,964	53,231	52,834	48,777	50,661	217,989	205,503	210,637
OPERATING INCOME	89,372	77,202	79,665	71,626	82,888	64,541	74,242	66,627	317,865	288,298	250,757
INTEREST INCOME (EXPENSE)
Interest income	51	33	28	57	33	84	129	131	169	377	640
Interest expense	(322)	(669)	(337)	(266)	(296)	(262)	(267)	(280)	(1,594)	(1,105)	(6,337)
Total interest income (expense)	(271)	(636)	(309)	(209)	(263)	(178)	(138)	(149)	(1,425)	(728)	(5,697)
INCOME BEFORE INCOME TAXES	89,101	76,566	79,356	71,417	82,625	64,363	74,104	66,478	316,440	287,570	245,060
PROVISION FOR INCOME TAXES	28,562	25,854	25,474	25,329	30,096	21,757	25,744	23,258	105,219	100,855	77,450
NET INCOME	$ 60,539	$ 50,712	$ 53,882	$ 46,088	$ 52,529	$ 42,606	$ 48,360	$ 43,220	$ 211,221	$ 186,715	$ 167,610
Earnings Per Share
Diluted earnings per share	$ 0.75	$ 0.63	$ 0.66	$ 0.56	$ 0.62	$ 0.50	$ 0.56	$ 0.50	$ 2.59	$ 2.19	$ 1.94
Diluted weighted average shares outstanding	81,086	81,094	81,634	82,589	84,276	85,467	85,986	85,854	81,601	85,396	86,619
Basic earnings per share	$ 0.75	$ 0.63	$ 0.66	$ 0.56	$ 0.63	$ 0.50	$ 0.57	$ 0.51	$ 2.60	$ 2.20	$ 1.95
Basic weighted average shares outstanding	80,904	80,880	81,432	82,195	83,740	84,981	85,450	85,294	81,353	84,866	86,040
Banking Systems and Services [Member]
REVENUE
License									$ 1,727	$ 1,514	$ 4,895
Support and service									922,545	853,500	794,433
Hardware									38,457	42,657	41,052
Total revenue									962,729	897,671	840,380
COST OF SALES
Cost of license									832	555	765
Cost of support and service									533,407	492,777	461,370
Cost of hardware									27,831	31,866	29,936
Total cost of sales									562,070	525,198	492,071
GROSS PROFIT									400,659	372,473	348,309
Credit Union Systems and Services [Member]
REVENUE
License									908	670	471
Support and service									278,107	258,831	248,368
Hardware									14,446	16,001	18,305
Total revenue									293,461	275,502	267,144
COST OF SALES
Cost of license									355	353	95
Cost of support and service									147,343	141,979	140,250
Cost of hardware									10,568	11,842	13,714
Total cost of sales									158,266	154,174	154,059
GROSS PROFIT									$ 135,195	$ 121,328	$ 113,085