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Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 318,098 $ 278,124  
Less: accumulated depreciation and amortization (198,197) (168,557)  
Property and equipment, net [1] 119,901 109,567 $ 95,436
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross [2] 191,437 160,399  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 82,467 75,921  
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 42,889 39,848  
Automobiles      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,305 $ 1,956  
[1] As of the end of the fiscal year.
[2] Depreciation expense for capitalized software was $12.8 million, $12.6 million and $11.3 million during fiscal 2018, 2017 and 2016, respectively. The net book value of the Company's computer software costs included in property and equipment, net was $46.4 million and $33.2 million as of April 30, 2018 and 2017, respectively.