Goodwill and Other Intangible Assets - Schedule of Intangible Assets Subject to Amortization and for Intangible Assets Not Subject to Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 465,744	$ 471,062
Accumulated Amortization	(304,995)	(302,713)
Net Carrying Value	160,749	168,349
Goodwill	204,396	206,101
Total intangible assets	365,145	374,450
Customer related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	216,921	219,893
Accumulated Amortization	(146,367)	(145,144)
Net Carrying Value	$ 70,554	$ 74,749
Weighted Average Remaining Life	8 years 1 month 6 days	8 years 6 months
Core technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 130,977	$ 130,226
Accumulated Amortization	(91,160)	(90,017)
Net Carrying Value	$ 39,817	$ 40,209
Weighted Average Remaining Life	7 years 3 months 18 days	7 years 4 months 24 days
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 21,827	$ 25,712
Accumulated Amortization	(19,084)	(19,030)
Net Carrying Value	$ 2,743	$ 6,682
Weighted Average Remaining Life	4 years 10 months 24 days	5 years
Capitalized Software Development Costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 24,065	$ 23,213
Accumulated Amortization	(10,971)	(10,006)
Net Carrying Value	$ 13,094	$ 13,207
Weighted Average Remaining Life	2 years 9 months 18 days	3 years
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 71,954	$ 72,018
Accumulated Amortization	(37,413)	(38,516)
Net Carrying Value	$ 34,541	$ 33,502
Weighted Average Remaining Life	4 years	4 years 2 months 12 days