Business Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Dec. 21, 2017	Aug. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Business Acquisition [Line Items]
Goodwill			$ 652,329		$ 652,329		$ 552,465
Ensenta Corporation [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Dec. 21, 2017
Payments to Acquire Businesses, Gross	$ 134,472
Current assets	13,950
Long-term assets	585
Identifiable intangible assets	55,001
Non-current deferred income tax liability	(19,969)
Total other liabilities assumed	(8,593)
Total identifiable net assets	40,974
Net assets acquired	134,472
Acquisition goodwill expected to be tax deductible	0
Cash Acquired from Acquisition	7,273
Acquired Receivable, Fair Value	4,668
Acquired Receivables, Gross Contractual Amount	4,668
Acquired Receivables, Estimated Uncollectible	0
Business Acquisition, Transaction Costs			262		262
Revenue of Acquiree since Acquisition Date, Actual			928		928
Earnings or Loss of Acquiree since Acquisition Date, Actual			6,366		6,366
Earnings or Loss of Acquiree since Acquisition Date, Excluding Effects of TCJA			26		26
Pro Forma Revenue			381,110	$ 354,358	747,808	$ 704,749
Pro Forma Net Income (Loss)			$ 156,211	$ 59,407	$ 220,495	$ 122,064
Pro Forma Earnings Per Share, Basic			$ 2.02	$ 0.76	$ 2.85	$ 1.56
Pro Forma Earnings Per Share, Diluted			$ 2.01	$ 0.76	$ 2.84	$ 1.55
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
Net assets acquired		10,744
Acquisition goodwill expected to be tax deductible		6,499
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			$ 395		$ 493
Earnings or Loss of Acquiree since Acquisition Date, Actual			$ (274)		$ (398)
Customer Relationships [Member] | Ensenta Corporation [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired	$ 33,824
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, Intangible Asset [Member] | Ensenta Corporation [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired	$ 16,639
Identifiable Intangible Assets, Weighted Average Useful Life	10 years
Computer Software, Intangible Asset [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	$ 4,538
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
Payments [Member] | Ensenta Corporation [Member]
Business Acquisition [Line Items]
Goodwill	$ 93,498
Complementary [Member] | Vanguard Software Group [Member]
Business Acquisition [Line Items]
Goodwill		$ 6,499