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, 2020	Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 507,651	$ 487,839
Accumulated Amortization	(346,838)	(333,728)
Net Carrying Value	160,813	154,111
Goodwill	220,899	205,713
Total intangible assets	381,712	359,824
Customer related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	229,526	219,305
Accumulated Amortization	(163,029)	(157,008)
Net Carrying Value	$ 66,497	$ 62,297
Weighted Average Remaining Life	7 years 8 months 12 days	7 years 6 months
Core technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 139,809	$ 135,720
Accumulated Amortization	(100,178)	(97,431)
Net Carrying Value	$ 39,631	$ 38,289
Weighted Average Remaining Life	6 years 10 months 24 days	7 years 2 months 12 days
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 22,363	$ 22,099
Accumulated Amortization	(20,296)	(19,927)
Net Carrying Value	$ 2,067	$ 2,172
Weighted Average Remaining Life	4 years 7 months 6 days	4 years 9 months 18 days
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 27,041	$ 26,222
Accumulated Amortization	(15,181)	(14,047)
Net Carrying Value	$ 11,860	$ 12,175
Weighted Average Remaining Life	1 year 9 months 18 days	2 years 10 months 24 days
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 88,912	$ 84,493
Accumulated Amortization	(48,154)	(45,315)
Net Carrying Value	$ 40,758	$ 39,178
Weighted Average Remaining Life	3 years 4 months 24 days	3 years 9 months 18 days