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Description of Stock Plans - Calculating Fair Value Options Granted Using the Black-Scholes Option- Pricing Model (Detail) | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Minimum |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Expected life of the options | 5 years 7 days | 5 years 6 months 8 days | 5 years 7 months 24 days
Maximum |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Expected life of the options | 9 years 9 months 29 days | 9 years 2 months 10 days | 9 years 10 months 2 days
Risk-free interest rate | Minimum |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock options, measurement input | 0.64% | 2.38% | 1.77%
Risk-free interest rate | Maximum |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock options, measurement input | 2.25% | 2.96% | 2.73%
Expected volatility |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock options, measurement input |  | 66.00% |
Expected volatility | Minimum |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock options, measurement input | 64.00% |  | 66.00%
Expected volatility | Maximum |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock options, measurement input | 66.00% |  | 73.00%
Expected dividend yield |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock options, measurement input | 0.00% | 0.00% | 0.00%
Expected forfeitures |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock options, measurement input | 29.00% | 28.00% |
Expected forfeitures | Minimum |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock options, measurement input |  |  | 28.00%
Expected forfeitures | Maximum |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock options, measurement input |  |  | 29.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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