Business Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		6 Months Ended
	Oct. 05, 2018	Oct. 01, 2018	Dec. 21, 2017	Aug. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Business Acquisition [Line Items]
Goodwill					$ 666,770		$ 666,770		$ 649,929
BOLTS Technologies, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 05, 2018
Payments to Acquire Businesses, Gross	$ 15,046
Current assets	1,384
Identifiable intangible assets	2,274
Total other liabilities assumed	(1,418)
Total identifiable net assets	2,240
Net assets acquired	15,046
Cash Acquired from Acquisition	1,365
Acquired Receivable, Fair Value	14
Acquired Receivables, Estimated Uncollectible	0
Business Acquisition, Transaction Costs	23
Revenue of Acquiree since Acquisition Date, Actual					35
Earnings or Loss of Acquiree since Acquisition Date, Actual					(246)
Business Combination, Acquired Receivables, Gross Contractual Amount	14
Agiletics, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Oct. 01, 2018
Payments to Acquire Businesses, Gross		$ 7,649
Current assets		2,170
Identifiable intangible assets		3,090
Non-current deferred income tax liability		(787)
Total other liabilities assumed		(738)
Total identifiable net assets		3,735
Net assets acquired		7,649
Cash Acquired from Acquisition		1,349
Acquired Receivable, Fair Value		299
Acquired Receivables, Estimated Uncollectible		0
Business Acquisition, Transaction Costs		25
Revenue of Acquiree since Acquisition Date, Actual					193
Earnings or Loss of Acquiree since Acquisition Date, Actual					(111)
Business Combination, Acquired Receivables, Gross Contractual Amount		299
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			14,125
Long-term assets			586
Identifiable intangible assets			58,806
Non-current deferred income tax liability			(21,859)
Total other liabilities assumed			(8,496)
Total identifiable net assets			43,162
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, Estimated Uncollectible			0
Business Acquisition, Transaction Costs									$ 339
Revenue of Acquiree since Acquisition Date, Actual					9,059	$ 928	17,231
Earnings or Loss of Acquiree since Acquisition Date, Actual					2,919	6,366	4,963
Earnings or Loss of Acquiree since Acquisition Date, Excluding Effects of TCJA						26
Pro Forma Revenue					386,275	363,563	778,818	$ 731,611
Pro Forma Net Income (Loss)					$ 68,089	$ 167,714	$ 151,640	$ 229,623
Pro Forma Earnings Per Share, Basic					$ 0.88	$ 2.17	$ 1.96	$ 2.97
Pro Forma Earnings Per Share, Diluted					$ 0.88	$ 2.16	$ 1.96	$ 2.96
Business Combination, Acquired Receivables, Gross Contractual Amount			4,668
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, Estimated Uncollectible				0
Revenue of Acquiree since Acquisition Date, Actual					$ 741	$ 557	$ 1,266	$ 656
Earnings or Loss of Acquiree since Acquisition Date, Actual					$ (86)	$ (178)	$ (254)	$ (301)
Business Combination, Acquired Receivables, Gross Contractual Amount				847
Customer Relationships [Member] | BOLTS Technologies, Inc. [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired	$ 567
Identifiable Intangible Assets, Weighted Average Useful Life	15 years
Customer Relationships [Member] | Agiletics, Inc. [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired		$ 2,198
Identifiable Intangible Assets, Weighted Average Useful Life		15 years
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] | BOLTS Technologies, Inc. [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired	$ 1,409
Identifiable Intangible Assets, Weighted Average Useful Life	10 years
Computer Software, Intangible Asset [Member] | Agiletics, Inc. [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired		$ 701
Identifiable Intangible Assets, Weighted Average Useful Life		10 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] | BOLTS Technologies, Inc. [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired	$ 298
Identifiable Intangible Assets, Weighted Average Useful Life	10 years
Other Intangible Assets [Member] | Agiletics, Inc. [Member]
Business Acquisition [Line Items]
Identifiable Intangible Assets Acquired		$ 191
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
Core [Member] | Agiletics, Inc. [Member]
Business Acquisition [Line Items]
Goodwill		$ 3,914
Payments [Member] | Ensenta Corporation [Member]
Business Acquisition [Line Items]
Goodwill			$ 91,219
Complementary [Member] | BOLTS Technologies, Inc. [Member]
Business Acquisition [Line Items]
Goodwill	$ 12,806
Complementary [Member] | Vanguard Software Group [Member]
Business Acquisition [Line Items]
Goodwill				$ 6,499