Acquisitions - Additional Information (Detail)	1 Months Ended								3 Months Ended					12 Months Ended
	Jun. 30, 2016 USD ($)	Nov. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Apr. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Feb. 28, 2014 USD ($)	Jul. 31, 2013 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Sep. 30, 2013 USD ($) Entity	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Business Acquisition [Line Items]
Purchase price, net of cash acquired														$ 53,000,000	$ 202,900,000	$ 96,900,000
Contingent consideration obligations	$ 5,500,000		$ 15,700,000						$ 5,500,000					5,500,000	15,700,000
Goodwill acquired	999,300,000		970,500,000						999,300,000					999,300,000	970,500,000
Increase (decrease) in fair value of contingent consideration													$ (3,300,000)
Number of acquisitions affected by change in fair value of contingent consideration | Entity													1
QED [Member]
Business Acquisition [Line Items]
Aggregate purchase price		$ 15,500,000
Purchase price, net of cash acquired		13,300,000
Escrow Deposit		1,500,000
Contingent consideration obligations		700,000
Contingent consideration maximum potential pay out		3,500,000
Liabilities assumed		400,000
Goodwill acquired		11,100,000
Intangible assets acquired		$ 4,800,000
Contingent consideration payment period		3 years
QED [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization period		10 years
QED [Member] | Software Technology [Member]
Business Acquisition [Line Items]
Amortization period		7 years
4sight Financial [Member]
Business Acquisition [Line Items]
Aggregate purchase price	38,300,000
Purchase price, net of cash acquired	36,000,000
Contingent consideration obligations	2,400,000								2,400,000					2,400,000
Contingent consideration maximum potential pay out	14,500,000								14,500,000					14,500,000
Liabilities assumed	11,700,000								11,700,000					11,700,000
Goodwill acquired	23,300,000								23,300,000					23,300,000
Intangible assets acquired	$ 26,800,000								26,800,000					26,800,000
4sight Financial [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization period	10 years
4sight Financial [Member] | Software Technology [Member]
Business Acquisition [Line Items]
Amortization period	6 years
Direxxis LLC [Member]
Business Acquisition [Line Items]
Aggregate purchase price					$ 34,500,000
Purchase price, net of cash acquired					33,300,000
Contingent consideration obligations					1,200,000
Contingent consideration maximum potential pay out					5,500,000
Goodwill acquired					20,600,000
Intangible assets acquired					$ 13,600,000
Contingent consideration payment period					3 years
Net assets/(liabilities) acquired/assumed					$ 300,000
Direxxis LLC [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization period					10 years
Direxxis LLC [Member] | Software Technology [Member]
Business Acquisition [Line Items]
Amortization period					5 years
WTRIS [Member]
Business Acquisition [Line Items]
Aggregate purchase price				$ 73,200,000
Purchase price, net of cash acquired				61,000,000
Contingent consideration obligations	$ 400,000			12,200,000					400,000					400,000
Goodwill acquired				39,100,000
Intangible assets acquired				$ 29,300,000
Increase (decrease) in goodwill											$ (900,000)
Contingent consideration payment period				24 months
Net assets/(liabilities) acquired/assumed				$ 4,800,000
Increase (decrease) in fair value of contingent consideration									(3,100,000)	$ (800,000)
Payment of contingent consideration									7,900,000
WTRIS [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization period				10 years
WTRIS [Member] | Software Technology [Member]
Business Acquisition [Line Items]
Amortization period				7 years
FSCI [Member]
Business Acquisition [Line Items]
Purchase price, net of cash acquired			77,000,000
Goodwill acquired			38,800,000												38,800,000
Intangible assets acquired			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 [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization period			10 years
TwoFour Systems [Member]
Business Acquisition [Line Items]
Aggregate purchase price						$ 32,700,000
Purchase price, net of cash acquired						31,600,000
Contingent consideration obligations	300,000					1,100,000			300,000					300,000
Contingent consideration maximum potential pay out						8,300,000
Goodwill acquired						25,500,000
Intangible assets acquired						$ 10,500,000
Contingent consideration payment period						3 years
Net assets/(liabilities) acquired/assumed						$ (3,300,000)
Payment of contingent consideration														800,000
TwoFour Systems [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization period						10 years
TwoFour Systems [Member] | Software Technology [Member]
Business Acquisition [Line Items]
Amortization period						7 years
Bonaire Software Solutions, LLC [Member]
Business Acquisition [Line Items]
Purchase price, net of cash acquired								$ 37,600,000
Contingent consideration obligations	$ 0							500,000	$ 0			$ 1,300,000		0		$ 1,300,000
Goodwill acquired								29,000,000
Intangible assets acquired								$ 10,100,000
Contingent consideration payment period								3 years
Net assets/(liabilities) acquired/assumed								$ (1,500,000)
Increase (decrease) in fair value of contingent consideration												$ 800,000		(1,000,000)	300,000
Payment of contingent consideration														$ 200,000	$ 400,000
Bonaire Software Solutions, LLC [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization period								10 years
Bonaire Software Solutions, LLC [Member] | Software Technology [Member]
Business Acquisition [Line Items]
Amortization period								7 years
Emerald Connect, LLC [Member]
Business Acquisition [Line Items]
Purchase price, net of cash acquired							$ 59,800,000
Goodwill acquired							41,100,000
Intangible assets acquired							20,800,000
Net assets/(liabilities) acquired/assumed							$ (2,100,000)
Emerald Connect, LLC [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization period							7 years