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Estimated Fair Value of Options on Dates of Each Grant Using Binomial Option Pricing Model (Detail)		12 Months Ended
		Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield		0.82%		0.00%	[1]
Expected volatility	[1]			0.00%
Risk-free interest rate, lower range		8.42%	8.21%	0.00%	[1]
Risk-free interest rate, upper range		8.63%	9.08%	0.00%	[1]
Expected term (in years)	[1]
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield			0.81%
Expected volatility		24.30%	28.57%
Expected term (in years)		4 years 1 month 17 days	3 years 9 months 22 days
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield			0.83%
Expected volatility		32.00%	41.52%
Expected term (in years)		5 years 5 months 12 days	5 years 5 months 9 days
[1] no options were granted during the period

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (f)(2)(iii)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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No definition available.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section S99



-Paragraph 1



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-Publisher SEC



-Name Staff Accounting Bulletin (SAB)



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-Section D



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