Revenue from Contracts with Customers Impact to Prior Period Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Current contract assets	$ 314,745						$ 314,745		$ 0
Contract costs	24,325						24,325		0
Total revenue	147,984			$ 125,871			402,576	$ 373,554
Subscription and software revenue				118,126				351,540
Gross profit	133,624			113,095			360,250	335,957
Selling and marketing	27,410			25,924			80,532	73,875
General and administrative	14,863			14,430			46,246	42,284
Total operating expenses	62,793			61,938			188,671	177,022
Income from operations	70,831			51,157			171,579	158,935
Interest income	6,835			23			21,389	204
Provision for (benefit from) income taxes	13,695			11,756			27,286	43,561
Net income	$ 61,587	$ 59,217	$ 38,066	$ 37,835			158,869	110,668
Deferred income taxes							(49,847)	4,467
Contract assets							(27,397)	0
Contract costs							$ (3,825)	$ 0
Earnings Per Share, Basic	$ 0.89			$ 0.53			$ 2.26	$ 1.53
Earnings Per Share, Diluted	$ 0.88			$ 0.52			$ 2.23	$ 1.51
Weighted Average Number of Shares Outstanding, Basic	69,423			71,828			70,286	72,402
Weighted Average Number of Shares Outstanding, Diluted	70,160			72,663			71,142	73,136
Accounts receivable, net	$ 45,293						$ 45,293		21,910
Non-current contract assets	358,709						358,709		0
Total assets	938,667						938,667		264,924
Current deferred revenue	24,415						24,415		286,845
Non-current deferred revenue	19,312						19,312		28,259
Deferred income taxes	154,901						154,901		0
Other non-current liabilities	12,403						12,403		18,492
Retained earnings	1,224,377						1,224,377		305,208
Accounts receivable							(4,183)	$ 964
Deferred revenue							17,983	(11,699)
Net cash provided by operating activities							153,136	127,829
Total liabilities and stockholders’ equity	938,667						938,667		264,924
License [Member]
Total revenue	98,493			$ 0			255,616	0
Maintenance [Member]
Total revenue	41,878			0			125,955	0
Services and other
Total revenue	$ 7,613			7,745			$ 21,005	22,014
Accounting Standards Update 2014-09 [Member]
Current contract assets									304,378
Contract costs									20,500
Total revenue				127,758				359,775
Subscription and software revenue				0				0
Gross profit				114,982				322,178
Selling and marketing				25,246				72,690
General and administrative				14,533				49,188
Total operating expenses				61,363				182,741
Income from operations				53,619				139,437
Interest income				6,304				18,849
Provision for (benefit from) income taxes				13,829				(63,681)
Net income				$ 44,505	$ 132,031	$ 40,521		217,057
Deferred income taxes								(123,443)
Contract assets								(7,767)
Contract costs								$ (651)
Earnings Per Share, Basic				$ 0.62				$ 3.00
Earnings Per Share, Diluted				$ 0.61				$ 2.97
Weighted Average Number of Shares Outstanding, Basic				71,828				72,402
Weighted Average Number of Shares Outstanding, Diluted				72,663				73,136
Accounts receivable, net									41,810
Non-current contract assets									340,622
Total assets									950,324
Current deferred revenue									15,150
Non-current deferred revenue									12,354
Deferred income taxes									214,125
Other non-current liabilities									17,068
Retained earnings									1,065,507
Accounts receivable								$ 1,429
Deferred revenue								15,847
Net cash provided by operating activities								127,829
Total liabilities and stockholders’ equity									950,324
Accounting Standards Update 2014-09 [Member] | License [Member]
Total revenue				$ 79,073				214,938
Accounting Standards Update 2014-09 [Member] | Maintenance [Member]
Total revenue				40,897				121,890
Accounting Standards Update 2014-09 [Member] | Services and other
Total revenue				7,788				22,947
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Current contract assets									304,378
Contract costs									20,500
Total revenue				1,887				(13,779)
Subscription and software revenue				(118,126)				(351,540)
Gross profit				1,887				(13,779)
Selling and marketing				(678)				(1,185)
General and administrative				103				6,904
Total operating expenses				(575)				5,719
Income from operations				2,462				(19,498)
Interest income				6,281				18,645
Provision for (benefit from) income taxes				2,073				(107,242)
Net income				6,670				106,389
Deferred income taxes								(127,910)
Contract assets								(7,767)
Contract costs								(651)
Accounts receivable, net									19,900
Non-current contract assets									340,622
Total assets									685,400
Current deferred revenue									(271,695)
Non-current deferred revenue									(15,905)
Deferred income taxes									214,125
Other non-current liabilities									(1,424)
Retained earnings									760,299
Accounts receivable								2,393
Deferred revenue								27,546
Net cash provided by operating activities								0
Total liabilities and stockholders’ equity									$ 685,400
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | License [Member]
Total revenue				79,073				214,938
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Maintenance [Member]
Total revenue				40,897				121,890
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Services and other
Total revenue				$ 43				$ 933