Acquisitions - Additional Information (Details) - USD ($)	1 Months Ended										3 Months Ended					12 Months Ended
	Mar. 31, 2017	Nov. 30, 2016	Sep. 30, 2016	Jul. 31, 2016	Jun. 30, 2016	Nov. 30, 2015	Jun. 30, 2015	Apr. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition [Line Items]
Purchase price, net of cash acquired																$ 448,700,000	$ 53,000,000	$ 202,900,000
Goodwill acquired					$ 999,300,000								$ 999,300,000			1,159,300,000	999,300,000
Intellectual property purchase price			$ 95,000,000									$ 95,000,000
Cash payment to acquire intellectual property			90,000,000													90,000,000	0	0
Obligation payable			5,000,000									5,000,000
Additional deferred payment			$ 40,000,000									40,000,000				40,000,000
Contingent consideration obligations																$ 6,700,000
NACC
Business Acquisition [Line Items]
Payment of contingent consideration				$ 410,000,000
Purchase price, net of cash acquired				406,200,000
Net tangible assets acquired in transaction				52,200,000
Goodwill acquired				135,700,000
Intangible assets				218,300,000
Net assets/(liabilities) acquired/assumed				$ 406,200,000
NACC | Customer Relationships
Business Acquisition [Line Items]
Intangible asset useful life																10 years
NACC | Software Technology
Business Acquisition [Line Items]
Intangible asset useful life																7 years
M&O
Business Acquisition [Line Items]
Payment of contingent consideration		$ 22,400,000
Goodwill acquired		17,200,000
Intangible assets		11,200,000
Aggregate purchase price		24,900,000
Note payable		2,500,000
Net tangible liabilities assumed		$ 3,500,000
M&O | Customer Relationships
Business Acquisition [Line Items]
Intangible asset useful life		7 years
M&O | Software Technology
Business Acquisition [Line Items]
Intangible asset useful life		6 years
MAL
Business Acquisition [Line Items]
Payment of contingent consideration	$ 20,100,000
Goodwill acquired	22,600,000
Intangible assets	14,700,000
Aggregate purchase price	24,800,000
Note payable	3,200,000
Net tangible liabilities assumed	$ 2,900,000
Equity interest in acquiree, percentage	25.00%
Equity interests in acquiree held by others, percentage	75.00%
Acquisition date fair value of contingent consideration liability	$ 1,400,000
Contingent consideration liability payable period	4 years
Contingent consideration maximum potential pay out	$ 2,800,000
Fair value of pre-existing investment	9,600,000
Nontaxable gain on investment	$ 9,300,000
MAL | Customer Relationships
Business Acquisition [Line Items]
Intangible asset useful life	7 years
MAL | Software Technology
Business Acquisition [Line Items]
Intangible asset useful life	5 years
QED
Business Acquisition [Line Items]
Purchase price, net of cash acquired						$ 13,300,000
Goodwill acquired						11,100,000
Intangible assets						4,800,000
Aggregate purchase price						15,500,000
Note payable						1,500,000
Contingent consideration maximum potential pay out						3,500,000
Contingent consideration obligations						$ 700,000										$ 500,000
Contingent consideration payment period						3 years
Liabilities assumed						$ 400,000
Increase (decrease) in fair value of contingent consideration																(200,000)
QED | Customer Relationships
Business Acquisition [Line Items]
Amortization period						10 years
QED | Software Technology
Business Acquisition [Line Items]
Amortization period						7 years
4sight Financial
Business Acquisition [Line Items]
Purchase price, net of cash acquired					36,000,000
Goodwill acquired					24,500,000								24,500,000				24,500,000
Intangible assets					26,800,000								26,800,000				26,800,000
Aggregate purchase price					39,600,000
Contingent consideration maximum potential pay out					14,500,000								14,500,000				14,500,000
Contingent consideration obligations					$ 3,600,000								3,600,000				3,600,000
Contingent consideration payment period					3 years
Liabilities assumed					$ 11,700,000								11,700,000				11,700,000
Increase (decrease) in fair value of contingent consideration																1,200,000
Increase (decrease) in goodwill												$ (1,800,000)
4sight Financial | Customer Relationships
Business Acquisition [Line Items]
Amortization period					10 years
4sight Financial | Software Technology
Business Acquisition [Line Items]
Amortization period					6 years
TwoFour Systems
Business Acquisition [Line Items]
Payment of contingent consideration																	$ 800,000
Purchase price, net of cash acquired										$ 31,600,000
Goodwill acquired										25,500,000
Intangible assets										10,500,000
Aggregate purchase price										32,700,000
Contingent consideration maximum potential pay out										8,300,000
Contingent consideration obligations										$ 1,100,000						300,000
Contingent consideration payment period										3 years
Net assets/(liabilities) acquired/assumed										$ (3,300,000)
TwoFour Systems | Customer Relationships
Business Acquisition [Line Items]
Amortization period										10 years
TwoFour Systems | Software Technology
Business Acquisition [Line Items]
Amortization period										7 years
Direxxis LLC
Business Acquisition [Line Items]
Payment of contingent consideration																700,000
Purchase price, net of cash acquired									$ 33,300,000
Goodwill acquired									20,600,000
Intangible assets									13,600,000
Aggregate purchase price									34,500,000
Contingent consideration maximum potential pay out									5,500,000
Contingent consideration obligations									$ 1,200,000							700,000
Contingent consideration payment period									3 years
Increase (decrease) in fair value of contingent consideration																$ 200,000
Net assets/(liabilities) acquired/assumed									$ 300,000
Direxxis LLC | Customer Relationships
Business Acquisition [Line Items]
Amortization period									10 years
Direxxis LLC | Software Technology
Business Acquisition [Line Items]
Amortization period									5 years
WTRIS
Business Acquisition [Line Items]
Payment of contingent consideration													7,900,000
Purchase price, net of cash acquired								$ 61,000,000
Goodwill acquired								39,100,000
Intangible assets								29,300,000
Aggregate purchase price								73,200,000
Contingent consideration obligations								$ 12,200,000			$ 0
Contingent consideration payment period								24 months
Increase (decrease) in fair value of contingent consideration											$ (400,000)		$ (3,100,000)	$ (800,000)
Increase (decrease) in goodwill															$ (900,000)
Net assets/(liabilities) acquired/assumed								$ 4,800,000
WTRIS | Customer Relationships
Business Acquisition [Line Items]
Amortization period								10 years
WTRIS | Software Technology
Business Acquisition [Line Items]
Amortization period								7 years
FSCI
Business Acquisition [Line Items]
Purchase price, net of cash acquired							$ 77,000,000
Goodwill acquired							38,800,000											38,800,000
Intangible assets							34,400,000											34,400,000
Increase (decrease) in goodwill															$ (1,400,000)
Net assets/(liabilities) acquired/assumed							$ 3,800,000											$ 3,800,000
FSCI | Customer Relationships
Business Acquisition [Line Items]
Amortization period							10 years