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Significant Accounting Policies - Summary of Estimated Useful Lives of Aamortizable Intangible Assets (Detail)
 12 Months Ended
Mar. 31, 2018
Customer related intangibles [member] | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives of the amortizable intangible assets 5 years
Customer related intangibles [member] | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives of the amortizable intangible assets 15 years
Marketing related intangibles [member] | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives of the amortizable intangible assets 3 years
Marketing related intangibles [member] | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives of the amortizable intangible assets 10 years