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Plan Assets as Percentage of Total Funds (Detail) - Gratuity	Mar. 31, 2022
Funds managed by insurance company (1)
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	100.00%
Funds managed by insurance company (1) | Government Securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	79.50%
Funds managed by insurance company (1) | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	14.00%
Funds managed by insurance company (1) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	5.70%
Funds managed by insurance company (1) | Other
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	0.80%
Funds managed by insurance company (2)
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	100.00%
Funds managed by insurance company (2) | Government Securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	25.90%
Funds managed by insurance company (2) | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	23.90%
Funds managed by insurance company (2) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	44.70%
Funds managed by insurance company (2) | Other
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	5.50%
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	26.90%
Funds managed by trust | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	23.40%
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	49.70%

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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.

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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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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