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Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail)
 12 Months Ended
Mar. 31, 2018
Buildings [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives of property and equipment 20 years
Computers and software [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives of property and equipment 3 years
Computers and software [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives of property and equipment 4 years
Furniture, fixtures and office equipment [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives of property and equipment 2 years
Furniture, fixtures and office equipment [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives of property and equipment 5 years
Vehicles [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives of property and equipment 3 years
Leasehold improvements [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives of property and equipment Lesser of estimated useful life or lease term