Revenue from Contracts with Customers Impact to Prior Period Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Current contract assets	$ 279,797				$ 279,797		$ 294,193
Total revenue	124,732		$ 140,423		258,823	$ 254,592
Gross profit	109,206		125,684		228,079	226,626
Selling and marketing	28,500		26,310		57,692	53,122
General and administrative	16,422		15,299		36,306	31,383
Total operating expenses	67,547		61,926		139,116	125,878
Income from operations	41,659		63,758		88,963	100,748
Interest income	8,428		7,485		16,404	14,554
Provision for (benefit from) income taxes	7,654		9,284		14,782	13,591
Net income	$ 38,275	$ 46,284	$ 59,217	$ 38,066	84,559	97,282
Deferred income taxes					(10)	(47,474)
Contract assets					(22,521)	(41,928)
Contract costs					$ (830)	$ (2,546)
Earnings Per Share, Basic	$ 0.56		$ 0.84		$ 1.24	$ 1.38
Earnings Per Share, Diluted	$ 0.56		$ 0.83		$ 1.22	$ 1.36
Weighted Average Number of Shares Outstanding, Basic	68,114		70,428		68,277	70,708
Weighted Average Number of Shares Outstanding, Diluted	68,844		71,148		69,090	71,600
Accounts receivable, net	$ 51,963				$ 51,963		47,784
Non-current contract assets	362,666				362,666		325,510
Total assets	1,044,555				1,044,555		903,065
Contract costs	25,877				25,877		24,982
Current deferred revenue	36,044				36,044		25,318
Non-current deferred revenue	16,724				16,724		19,573
Deferred income taxes	159,542				159,542		159,071
Other non-current liabilities	4,806				4,806		10,381
Retained earnings	1,344,543				1,344,543		1,259,984
Accounts receivable					(4,539)	$ (16,464)
Deferred revenue					7,936	14,154
Net cash provided by operating activities					62,207	63,097
Total liabilities and stockholders’ equity	1,044,555				1,044,555		$ 903,065
License [Member]
Total revenue	70,196		$ 93,368		151,367	157,123
Maintenance [Member]
Total revenue	45,290		41,038		88,864	84,077
Services and other
Total revenue	$ 9,246		$ 6,017		$ 18,592	$ 13,392