Organization and Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Jul. 31, 2019 USD ($) Segment	Jul. 31, 2018 USD ($)	Apr. 30, 2019 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of business segments | Segment	3
Impairment of goodwill	$ 0		$ 0
Impairment of intangible assets	0		$ 0
Purchase price allocated to indefinite lived trade name intangible assets		$ 106,600,000
Performance-related bonus expenses	53,000,000.0	61,000,000.0
Accounting Standards Update 2016-02
Organization And Summary Of Significant Accounting Policies [Line Items]
ROU assets	236,100,000
Lease liability	272,300,000
ROU asset adjusted by reclassification of pre-existing prepaid expenses and other assets	5,100,000
ROU asset adjusted by reclassification of deferred rent	$ 41,300,000
General and Administrative Expenses
Organization And Summary Of Significant Accounting Policies [Line Items]
Impairment of intangible assets		$ 106,600,000
Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Intangible assets estimated useful lives	1 year
Amortization of long-term retention awards	4 years
Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Intangible assets estimated useful lives	24 years
Amortization of long-term retention awards	5 years
Affiliated Entity
Organization And Summary Of Significant Accounting Policies [Line Items]
Investments in affiliated companies maximum	50.00%
Mexico Subsidiary
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of Noncontrolling interest in subsidiary	51.00%