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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017	Apr. 30, 2017
Organization And Summary Of Significant Accounting Policies [Line Items]
Investments in affiliated companies maximum	50.00%		50.00%
Deferred revenue	$ 110,900,000		$ 110,900,000		$ 95,800,000
Impairment of goodwill			0		0
Impairment of intangible assets			0		$ 0
Performance related bonus expenses	$ 56,800,000	$ 41,100,000	$ 155,200,000	$ 136,200,000
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
Mexico Subsidiary
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of Noncontrolling interest in subsidiary	51.00%		51.00%

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
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