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Weighted-Average Asset Allocation of Said Plan Assets for Pension Benefits (Detail) - Pension	Mar. 31, 2016
Funds managed by trust
Weighted-average asset allocation	100.00%
Government of India securities
Funds managed by trust
Weighted-average asset allocation	6.50%
Debenture and bonds
Funds managed by trust
Weighted-average asset allocation	83.50%
Other securities
Funds managed by trust
Weighted-average asset allocation	10.00%

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- References

No definition available.

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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=65897934&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=65897934&loc=d3e1928-114920

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