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v3.20.2

Plan Assets as Percentage of Total Funds (Detail) - Gratuity | Mar. 31, 2020
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Funds managed by insurance company (1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 100.00% | [1]
Funds managed by insurance company (1) | Government Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 81.20% | [1]
Funds managed by insurance company (1) | Debenture and bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 13.80% | [1]
Funds managed by insurance company (1) | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 4.90% | [1]
Funds managed by insurance company (1) | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 0.10% | [1]
Funds managed by insurance company (2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 100.00% | [1]
Funds managed by insurance company (2) | Government Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 17.80% | [1]
Funds managed by insurance company (2) | Debenture and bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 32.00% | [1]
Funds managed by insurance company (2) | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 48.10% | [1]
Funds managed by insurance company (2) | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 2.10% | [1]
Funds managed by trust |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 100.00% |
Funds managed by trust | Government Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 37.50% |
Funds managed by trust | Debenture and bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 38.20% |
Funds managed by trust | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 0.00% |
Funds managed by trust | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset as percentage of total funds | 24.30% |
[1] | The data pertaining to plan investment assets measured at fair value by level and total at March 31, 2020 are provided separately.

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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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