Business Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Dec. 21, 2017	Aug. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Business Acquisition [Line Items]
Goodwill			$ 649,929		$ 649,929
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
Non-current deferred income tax liability	(21,716)
Total other liabilities assumed	(8,450)
Total identifiable net assets	43,283
Net assets acquired	134,381
Acquisition goodwill expected to be tax deductible	0
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			8,172
Earnings or Loss of Acquiree since Acquisition Date, Actual			2,044
Pro Forma Revenue			392,543	$ 368,048
Pro Forma Net Income (Loss)			$ 83,551	$ 67,733
Pro Forma Earnings Per Share, Basic			$ 1.08	$ 0.88
Pro Forma Earnings Per Share, Diluted			$ 1.08	$ 0.87
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			$ 525	$ 99
Earnings or Loss of Acquiree since Acquisition Date, Actual			$ (180)	$ (127)
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, Intangible Asset [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, 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	$ 4,501
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
Payments [Member] | Ensenta Corporation [Member]
Business Acquisition [Line Items]
Goodwill	$ 91,098
Complementary [Member] | Vanguard Software Group [Member]
Business Acquisition [Line Items]
Goodwill		$ 6,499