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Fair Value Measurement -Summary of significant unobservable inputs adopted in the valuation (Detail) - Significant Unobservable Inputs (Level 3) - Valuation, Income Approach
Mar. 31, 2021
Mar. 31, 2020
Revenue growth rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.08 0.12
Revenue growth rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 3.27 2.17
Weighted average cost of capital    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.30 0.20
Lack of Marketability Discount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.30 0.30
EBIT margin rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.17 (0.295)
EBIT margin rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.29 0.273