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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

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- Definition

Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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- Definition

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+ References

No definition available.

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