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Goodwill and Intangible Assets - Summary of Estimated Remaining Amortization Period for Intangible Assets Acquired on Acquisition (Detail)
 12 Months Ended
Mar. 31, 2020
ATCO I-Tek [member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 4 years 6 months
Appirio Inc [member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 1 year 9 months
International TechneGroup Incorporated [Member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 4 years 6 months
Bottom of range [member] | Cellent AG [member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 9 months
Bottom of range [member] | Vara Infotech Private Limited [member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 6 years 6 months
Bottom of range [member] | Rational Interaction, Inc. [Member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 2 years 9 months
Bottom of range [member] | Other Entities [member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 3 months
Top of range [member] | Cellent AG [member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 2 years 9 months
Top of range [member] | Vara Infotech Private Limited [member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 9 years 6 months
Top of range [member] | Rational Interaction, Inc. [Member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 6 years 9 months
Top of range [member] | Other Entities [member]  
Disclosure of intangible assets material to entity [line items]  
Remaining amortization period for intangible assets 12 years 3 months