Leases - Additional Information (Detail) $ in Thousands	12 Months Ended
	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($) Facility	Apr. 30, 2019 USD ($)
Lessee Lease Description [Line Items]
Lessee operating lease, existence of option to extend [true/false]	true
Lessee operating lease, existence of option to terminate [true/false]	true
Operating lease right-of-use assets, net	$ 174,121	$ 195,077
Lease liability	$ 203,984
ROU assets, impairment charge		2,282
Rent expense			$ 58,200
Acquired Companies
Lessee Lease Description [Line Items]
Operating lease right-of-use assets, net		3,200
Lease liability		6,700
ROU asset adjusted by reclassification of pre-existing prepaid expenses, restructuring liabilities and deferred rent		$ 3,500
Number of office leases closed | Facility		16
ROU assets, impairment charge		$ 2,300
Minimum
Lessee Lease Description [Line Items]
Lessee operating lease, term of contract	1 year
Lessee finance lease, term of contract	1 year
Maximum
Lessee Lease Description [Line Items]
Lessee operating lease, term of contract	11 years
Lessee finance lease, term of contract	5 years