Nature of Operations and Summary of Significant Accounting Policies Impact of Adoption of ASC 606 on Previously Reported Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 93,628	$ 31,440	$ 114,765	$ 70,310
Receivables, net	310,080	297,271
Income tax receivable	17,817	21,671
Prepaid expenses and other	106,466	96,069
Deferred costs	35,102	22,991
Assets held for sale	6,355	1,300
Total current assets	569,448	470,742
PROPERTY AND EQUIPMENT, net	272,474	285,550
OTHER ASSETS:
Non-current deferred costs	90,084	74,865
Computer software, net of amortization	318,969	288,172
Other non-current assets	134,743	110,299
Other intangible assets, net of amortization	31,514	38,467
Goodwill	666,944	649,929
Total other assets	1,342,907	1,276,766
Total assets	2,184,829	2,033,058
CURRENT LIABILITIES:
Accounts payable	9,850	30,360
Accrued expenses	120,360	88,764
Deferred revenues	339,752	328,931
Total current liabilities	469,962	448,055
LONG-TERM LIABILITIES:
Non-current deferred revenues	54,554	40,984
Deferred income tax liability	217,010	208,303
Other long-term liabilities	14,290	12,872
Total long-term liabilities	285,854	262,159
Total liabilities	755,816	710,214
STOCKHOLDERS' EQUITY
Preferred stock - $1 par value; 500,000 shares authorized, none issued	0	0
Common stock - $0.01 par value; 250,000,000 shares authorized; 103,278,562 shares issued at June 30, 2018	1,035	1,033
Additional paid-in capital	472,029	464,138
Retained earnings	2,066,073	1,912,933
Less treasury stock at cost; 26,107,903 shares at June 30, 2018	(1,110,124)	(1,055,260)
Total stockholders' equity	1,429,013	1,322,844	1,099,693
Total liabilities and equity	2,184,829	2,033,058
Previously Reported [Member]
CURRENT ASSETS:
Cash and cash equivalents		31,440	114,765	70,310
Receivables, net		291,630
Income tax receivable		21,671
Prepaid expenses and other		84,738
Deferred costs		34,907
Total current assets		465,686
PROPERTY AND EQUIPMENT, net		285,550
OTHER ASSETS:
Non-current deferred costs		95,540
Computer software, net of amortization		288,172
Other non-current assets		107,775
Other intangible assets, net of amortization		38,467
Goodwill		649,929
Total other assets		1,294,917
Total assets		2,046,153
CURRENT LIABILITIES:
Accounts payable		30,360
Accrued expenses		97,848
Deferred revenues		355,538
Total current liabilities		483,746
LONG-TERM LIABILITIES:
Non-current deferred revenues		93,094
Deferred income tax liability		189,613
Other long-term liabilities		12,872
Total long-term liabilities		295,579
Total liabilities		779,325
STOCKHOLDERS' EQUITY
Preferred stock - $1 par value; 500,000 shares authorized, none issued		0
Common stock - $0.01 par value; 250,000,000 shares authorized; 103,278,562 shares issued at June 30, 2018		1,033
Additional paid-in capital		464,138
Retained earnings		1,856,917
Less treasury stock at cost; 26,107,903 shares at June 30, 2018		(1,055,260)
Total stockholders' equity		1,266,828
Total liabilities and equity		2,046,153
Restatement Adjustment [Member]
CURRENT ASSETS:
Prepaid expenses and other		(72)
Deferred costs		(4,078)
Assets held for sale		1,300
CURRENT LIABILITIES:
Accounts payable		(4,150)
Deferred revenues		(23,500)
LONG-TERM LIABILITIES:
Non-current deferred revenues		23,500
Accounting Standards Update 2014-09 [Member]
CURRENT ASSETS:
Cash and cash equivalents		0	$ 0	$ 0
Receivables, net		5,641
Income tax receivable		0
Prepaid expenses and other		11,331
Deferred costs		(11,916)
Assets held for sale		0
Total current assets		5,056
PROPERTY AND EQUIPMENT, net		0
OTHER ASSETS:
Non-current deferred costs		(20,675)
Computer software, net of amortization		0
Other non-current assets		2,524
Other intangible assets, net of amortization		0
Goodwill		0
Total other assets		(18,151)
Total assets		(13,095)
CURRENT LIABILITIES:
Accounts payable		0
Accrued expenses		(9,084)
Deferred revenues		(26,607)
Total current liabilities		(35,691)
LONG-TERM LIABILITIES:
Non-current deferred revenues		(52,110)
Deferred income tax liability		18,690
Other long-term liabilities		0
Total long-term liabilities		(33,420)
Total liabilities		(69,111)
STOCKHOLDERS' EQUITY
Preferred stock - $1 par value; 500,000 shares authorized, none issued		0
Common stock - $0.01 par value; 250,000,000 shares authorized; 103,278,562 shares issued at June 30, 2018		0
Additional paid-in capital		0
Retained earnings		56,016
Less treasury stock at cost; 26,107,903 shares at June 30, 2018		0
Total stockholders' equity		56,016
Total liabilities and equity		(13,095)
Customer Relationships [Member]
OTHER ASSETS:
Customer relationships, net of amortization	$ 100,653	115,034
Customer Relationships [Member] | Previously Reported [Member]
OTHER ASSETS:
Customer relationships, net of amortization		115,034
Customer Relationships [Member] | Accounting Standards Update 2014-09 [Member]
OTHER ASSETS:
Customer relationships, net of amortization		$ 0