Business Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Dec. 21, 2017	Aug. 31, 2017	Jul. 01, 2015	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition [Line Items]
Goodwill				$ 649,929	$ 552,465
Ensenta Corporation [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Dec. 21, 2017
Payments to Acquire Businesses, Gross	$ 134,381
Current assets	14,057
Long-term assets	586
Identifiable intangible assets	58,806
Deferred income tax liability	21,716
Total other liabilities assumed	8,450
Total identifiable net assets	43,283
Acquisition goodwill expected to be tax deductible	0
Net assets acquired	134,381
Cash Acquired from Acquisition	7,274
Acquired Receivable, Fair Value	4,668
Acquired Receivables, Gross Contractual Amount	4,668
Acquired Receivables, Estimated Uncollectible	0
Business Acquisition, Transaction Costs				339
Revenue of Acquiree since Acquisition Date, Actual				15,776
Earnings or Loss of Acquiree since Acquisition Date, Actual				8,197
Earnings or Loss of Acquiree since Acquisition Date, Excluding Effects of TCJA				536
Pro Forma Revenue				1,549,721	1,454,700
Pro Forma Net Income (Loss)				$ 380,327	$ 247,928
Pro Forma Earnings Per Share, Basic				$ 4.92	$ 3.18
Pro Forma Earnings Per Share, Diluted				$ 4.90	$ 3.17
Vanguard Software Group [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Aug. 31, 2017
Payments to Acquire Businesses, Gross		$ 10,744
Current assets		1,153
Long-term assets		9
Identifiable intangible assets		4,200
Total liabilities assumed		(1,117)
Total identifiable net assets		4,245
Acquisition goodwill expected to be tax deductible		6,499
Net assets acquired		10,744
Cash Acquired from Acquisition		289
Acquired Receivable, Fair Value		847
Acquired Receivables, Gross Contractual Amount		847
Acquired Receivables, Estimated Uncollectible		0
Revenue of Acquiree since Acquisition Date, Actual				$ 1,369
Earnings or Loss of Acquiree since Acquisition Date, Actual				(940)
Business Acquisition, Bayside Business Solutions [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition			Jul. 01, 2015
Payments to Acquire Businesses, Gross			$ 10,000
Business Acquisition, Transaction Costs					$ 55
Revenue of Acquiree since Acquisition Date, Actual				7,670	6,536	$ 4,273
Earnings or Loss of Acquiree since Acquisition Date, Actual				1,620	1,307	303
Customer Relationships [Member] | Ensenta Corporation [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired	$ 37,800
Identifiable Intangible Assets, Weighted Average Useful Life	15 years
Customer Relationships [Member] | Vanguard Software Group [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired		$ 2,234
Identifiable Intangible Assets, Weighted Average Useful Life		15 years
Computer Software [Member] | Ensenta Corporation [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired	$ 16,505
Identifiable Intangible Assets, Weighted Average Useful Life	10 years
Computer Software [Member] | Vanguard Software Group [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired		$ 1,426
Identifiable Intangible Assets, Weighted Average Useful Life		10 years
Other Intangible Assets [Member] | Ensenta Corporation [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired	$ 4,501
Identifiable Intangible Assets, Weighted Average Useful Life	10 years
Other Intangible Assets [Member] | Vanguard Software Group [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired		$ 540
Identifiable Intangible Assets, Weighted Average Useful Life		10 years
Complementary [Member]
Business Acquisition [Line Items]
Goodwill				128,769	122,403	122,791
Complementary [Member] | Vanguard Software Group [Member]
Business Acquisition [Line Items]
Goodwill		$ 6,499
Payments [Member]
Business Acquisition [Line Items]
Goodwill				$ 325,204	$ 234,106	$ 234,106
Payments [Member] | Ensenta Corporation [Member]
Business Acquisition [Line Items]
Goodwill	$ 91,098