Goodwill and Other Intangible Assets - Schedule of Intangible Assets Subject to Amortization and for Intangible Assets Not Subject to Amortization (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 448,984	$ 435,692
Accumulated Amortization	(288,848)	(273,907)
Net Carrying Value	160,136	161,785
Goodwill	200,786	200,024
Total intangible assets	360,922	361,809
Customer Related [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	207,608	201,214
Accumulated Amortization	(138,800)	(134,133)
Net Carrying Value	$ 68,808	$ 67,081
Weighted Average Remaining Life	8 years 4 months 24 days	8 years 4 months 24 days
Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 129,987	$ 130,257
Accumulated Amortization	(86,373)	(82,815)
Net Carrying Value	$ 43,614	$ 47,442
Weighted Average Remaining Life	7 years 9 months 18 days	8 years 1 month 6 days
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 21,954	$ 21,983
Accumulated Amortization	(18,123)	(17,299)
Net Carrying Value	$ 3,831	$ 4,684
Weighted Average Remaining Life	5 years 1 month 6 days	5 years 3 months 18 days
Software Developed Other Than For Internal Use [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 21,282	$ 19,527
Accumulated Amortization	(7,946)	(6,265)
Net Carrying Value	$ 13,336	$ 13,262
Weighted Average Remaining Life	3 years 6 months	4 years
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 68,153	$ 62,711
Accumulated Amortization	(37,606)	(33,395)
Net Carrying Value	$ 30,547	$ 29,316
Weighted Average Remaining Life	4 years 6 months	4 years 6 months