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Plan Assets as Percentage of Total Funds (Detail) - Gratuity	Mar. 31, 2017
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	71.60%	[1]
Funds managed by insurance company (1) | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	20.80%	[1]
Funds managed by insurance company (1) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	5.50%	[1]
Funds managed by insurance company (1) | Other
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	2.10%	[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	22.70%	[1]
Funds managed by insurance company (2) | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	25.20%	[1]
Funds managed by insurance company (2) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	49.20%	[1]
Funds managed by insurance company (2) | Other
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	2.90%	[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	34.80%
Funds managed by trust | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	49.10%
Funds managed by trust | Other
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	16.10%
[1] The data pertaining to plan investment assets measured at fair value by level and total at March 31, 2017 are provided separately.

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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

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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