CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Current assets:
Cash and cash equivalents	$ 71,926				$ 96,165
Accounts receivable, net	47,784				21,910
Current contract assets	294,193				0
Prepaid expenses and other current assets	12,628
Prepaid income taxes	2,509
Total current assets	429,040
Property, equipment and leasehold improvements, net	7,234				9,806
Computer software development costs, net	1,306
Goodwill	78,383
Intangible assets, net	33,607				35,310
Non-current contract assets	325,510				0
Contract costs	24,982				0
Non-current deferred tax assets	1,669				11,090
Other non-current assets	1,334
Total assets	903,065				264,924
Current liabilities:
Accounts payable	5,891
Accrued expenses and other current liabilities	54,594				39,515
Income taxes payable	14,952
Borrowings under credit agreement	220,000
Current deferred revenue	25,318				286,845
Total current liabilities	320,755
Non-current deferred revenue	19,573				28,259
Deferred income taxes	159,071				0
Other non-current liabilities	10,381				18,492
Commitments and contingencies (Note 16)
Series D redeemable convertible preferred stock, $0.10 par value—Authorized—3,636 shares as of June 30, 2019 and 2018 Issued and outstanding—none as of June 30, 2019 and 2018	0
Stockholders' deficit:
Common stock, $0.10 par value—Authorized—210,000,000 shares Issued—103,642,292 shares at June 30, 2019 and 103,130,300 shares at June 30, 2018 Outstanding—68,624,566 shares at June 30, 2019 and 71,186,701 shares at June 30, 2018	10,365
Additional paid-in capital	739,099
Retained earnings	1,259,984				305,208
Accumulated other comprehensive income	336
Treasury stock, at cost— 35,017,726 shares of common stock at June 30, 2019 and 31,943,599 shares at June 30, 2018	(1,616,499)
Total stockholders' equity	393,285						$ (75,034)
Total liabilities and stockholders' equity	$ 903,065				264,924
Accounting Standards Update 2014-09 (Topic 606) [Member]
Current assets:
Cash and cash equivalents		$ 65,592	$ 54,428	$ 52,048	96,165	$ 101,954	318,336
Accounts receivable, net		41,640	52,933	50,346	41,810
Current contract assets		270,732	265,686	238,495	237,537
Current contract costs		0	0	0	0
Prepaid expenses and other current assets		11,124	10,330	12,992	10,509
Prepaid income taxes		1,573	921	1,422	2,601
Total current assets		390,661	384,298	355,303	388,622
Property, equipment and leasehold improvements, net		7,589	8,311	9,006	9,806
Computer software development costs, net		1,452	691	695	646
Goodwill		73,534	74,802	75,649	75,590
Intangible assets, net		31,756	32,889	34,192	35,310
Non-current contract assets		318,752	338,060	353,449	319,840
Contract costs		24,325	23,046	21,296	20,500
Non-current deferred tax assets		1,696	1,651	1,176	1,232
Other non-current assets		1,279	1,075	1,279	1,297
Total assets		851,044	864,823	852,045	852,843
Current liabilities:
Accounts payable		4,023	5,249	2,501	4,230
Accrued expenses and other current liabilities		42,746	36,688	32,000	39,515
Income taxes payable		35,582	43,573	46,869	1,698
Borrowings under credit agreement		220,000	220,000	170,000	170,000
Current deferred revenue		24,415	23,145	23,737	15,150
Total current liabilities		326,766	328,655	275,107	230,593
Non-current deferred revenue		19,312	18,167	15,046	12,354
Deferred income taxes		135,535	137,872	140,197	184,901
Other non-current liabilities		12,403	16,192	16,833	17,068
Commitments and contingencies (Note 16)
Series D redeemable convertible preferred stock, $0.10 par value—Authorized—3,636 shares as of June 30, 2019 and 2018 Issued and outstanding—none as of June 30, 2019 and 2018		0	0	0	0
Stockholders' deficit:
Common stock, $0.10 par value—Authorized—210,000,000 shares Issued—103,642,292 shares at June 30, 2019 and 103,130,300 shares at June 30, 2018 Outstanding—68,624,566 shares at June 30, 2019 and 71,186,701 shares at June 30, 2018		10,348	10,340	10,328	10,313
Additional paid-in capital		730,830	725,493	724,752	715,475
Retained earnings		1,156,120	1,094,533	1,035,316	997,250
Accumulated other comprehensive income		1,229	70	965	1,388
Treasury stock, at cost— 35,017,726 shares of common stock at June 30, 2019 and 31,943,599 shares at June 30, 2018		(1,541,499)	(1,466,499)	(1,366,499)	(1,316,499)
Total stockholders' equity		357,028	363,937	404,862	407,927	$ 286,243	$ 454,803
Total liabilities and stockholders' equity		$ 851,044	$ 864,823	$ 852,045	$ 852,843