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Plan Assets as Percentage of Total Funds (Detail) - Gratuity | Mar. 31, 2017
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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 | 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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- 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 + Details
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