Revenue from Contracts with Customers Impact to Prior Period Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Current contract assets	$ 294,193				$ 0				$ 294,193	$ 0
Revenue									598,345	499,514	$ 482,942
Subscription and software revenue										471,041	453,512
Gross profit	180,279	$ 133,624	$ 125,684	$ 100,942					540,529	448,870	435,476
Selling and marketing									111,374	101,077	92,633
General and administrative									63,231	56,076	51,297
Total operating expenses									257,727	239,229	223,460
Income from operations	111,223	70,831	63,758	36,990					282,802	209,641	212,016
Interest income									28,457	231	808
Provision for (benefit from) income taxes									40,456	54,655	48,150
Net income	$ 103,865	$ 61,587	$ 59,217	$ 38,066					$ 262,734	$ 148,688	$ 162,196
Basic (in dollars per share)	$ 1.51	$ 0.89	$ 0.84	$ 0.54					$ 3.76	$ 2.06	$ 2.12
Earnings Per Share, Diluted	$ 1.49	$ 0.88	$ 0.83	$ 0.53					$ 3.71	$ 2.04	$ 2.11
Basic (in shares)	68,839	69,423	70,428	70,988					69,925	72,140	76,491
Diluted (in shares)	69,638	70,160	71,148	72,015					70,787	72,956	76,978
Contract costs	$ 24,982				0				$ 24,982	$ 0
Accounts receivable, net	47,784				21,910				47,784	21,910
Non-current contract assets	325,510				0				325,510	0
Non-current deferred tax assets	1,669				11,090				1,669	11,090
Assets	903,065				264,924				903,065	264,924
Current deferred revenue	25,318				286,845				25,318	286,845
Non-current deferred revenue	19,573				28,259				19,573	28,259
Deferred income taxes	159,071				0				159,071	0
Other non-current liabilities	10,381				18,492				10,381	18,492
Retained earnings	1,259,984				305,208				1,259,984	305,208
Total liabilities and stockholders' equity	$ 903,065				264,924				903,065	264,924
Deferred income taxes									(26,839)	3,193	$ (4,286)
Contract assets									(59,322)	0	0
Contract costs									(4,482)	0	0
Accounts receivable									(6,626)	(4,327)	(7,480)
Deferred revenue									17,799	13,700	18,477
Net cash provided by operating activities									238,313	206,936	182,386
License [Member]
Revenue									404,122	0	0
Maintenance [Member]
Revenue									165,436	0	0
Services and other [Member]
Revenue									28,787	28,473	29,430
Accounting Standards Update 2014-09 (Topic 606) [Member]
Current contract assets		$ 270,732	$ 265,686	$ 238,495	237,537					237,537
Revenue										518,859	494,427
Subscription and software revenue										0	0
Gross profit					146,037	$ 114,983	$ 93,440	$ 113,755		468,215	446,961
Selling and marketing										99,737	91,977
General and administrative										67,181	58,735
Total operating expenses										248,994	230,242
Income from operations					79,784	53,620	30,104	55,714		219,221	216,719
Interest income										24,954	22,942
Provision for (benefit from) income taxes										(56,057)	57,797
Net income					$ 76,646	$ 44,506	$ 132,030	$ 40,521		$ 293,703	$ 179,386
Basic (in dollars per share)					$ 1.07	$ 0.62	$ 1.83	$ 0.55		$ 4.07	$ 2.35
Earnings Per Share, Diluted					$ 1.06	$ 0.61	$ 1.81	$ 0.55		$ 4.03	$ 2.33
Basic (in shares)					71,349	71,828	72,342	73,024		72,140	76,491
Diluted (in shares)					72,315	72,663	73,036	73,609		72,956	76,978
Contract costs		24,325	23,046	21,296	$ 20,500					$ 20,500
Accounts receivable, net		41,640	52,933	50,346	41,810					41,810
Non-current contract assets		318,752	338,060	353,449	319,840					319,840
Non-current deferred tax assets		1,696	1,651	1,176	1,232					1,232
Assets		851,044	864,823	852,045	852,843					852,843
Current deferred revenue		24,415	23,145	23,737	15,150					15,150
Non-current deferred revenue		19,312	18,167	15,046	12,354					12,354
Deferred income taxes		135,535	137,872	140,197	184,901					184,901
Other non-current liabilities		12,403	16,192	16,833	17,068					17,068
Retained earnings		1,156,120	1,094,533	1,035,316	997,250					997,250
Total liabilities and stockholders' equity		$ 851,044	$ 864,823	$ 852,045	852,843					852,843
Deferred income taxes										(110,308)	$ 5,273
Contract assets										3,640	(4,327)
Contract costs										(617)	(203)
Accounts receivable										846	(8,164)
Deferred revenue										(17,356)	(3,058)
Net cash provided by operating activities										206,936	182,386
Accounting Standards Update 2014-09 (Topic 606) [Member] | License [Member]
Revenue										326,549	307,259
Accounting Standards Update 2014-09 (Topic 606) [Member] | Maintenance [Member]
Revenue										161,065	157,012
Accounting Standards Update 2014-09 (Topic 606) [Member] | Services and other [Member]
Revenue										31,245	30,156
Adjustments for Topic 606
Current contract assets					237,537					237,537
Revenue										19,345	11,485
Subscription and software revenue										(471,041)	(453,512)
Gross profit										19,345	11,485
Selling and marketing										(1,340)	(656)
General and administrative										11,105	7,438
Total operating expenses										9,765	6,782
Income from operations										9,580	4,703
Interest income										24,723	22,134
Provision for (benefit from) income taxes										(110,712)	9,647
Net income										145,015	17,190
Contract costs					20,500					20,500
Accounts receivable, net					19,900					19,900
Non-current contract assets					319,840					319,840
Non-current deferred tax assets					(9,858)					(9,858)
Assets					587,919					587,919
Current deferred revenue					(271,695)					(271,695)
Non-current deferred revenue					(15,905)					(15,905)
Deferred income taxes					184,901					184,901
Other non-current liabilities					(1,424)					(1,424)
Retained earnings					692,042					692,042		$ 529,837
Total liabilities and stockholders' equity					$ 587,919					587,919
Deferred income taxes										(113,501)	9,559
Contract assets										3,640	(4,327)
Contract costs										(617)	(203)
Accounts receivable										3,481	(684)
Deferred revenue										(31,056)	(21,535)
Net cash provided by operating activities										0	0
Adjustments for Topic 606 | License [Member]
Revenue										326,549	307,259
Adjustments for Topic 606 | Maintenance [Member]
Revenue										161,065	157,012
Adjustments for Topic 606 | Services and other [Member]
Revenue										2,772	726
Subscription and software
Revenue									$ 569,558
Subscription and software | Accounting Standards Update 2014-09 (Topic 606) [Member]
Revenue										$ 487,614	$ 464,271