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Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013		Mar. 31, 2012
Stock-Based Compensation And Incentive Plans [Abstract]
Weighted-average Exercise Price Beginning Balance Outstanding	$ 46.24	$ 44.93		$ 45.36
Weighted-average Exercise Price-Granted			[1]		[1]
Weighted-average Exercise Price-Exercised	$ 36.86	$ 29.09		$ 38.71
Weighted-average Exercise Price-Expired or cancelled/forfeited		$ 52.47		$ 56.44
Weighted-average Exercise Price, Ending Balance Outstanding	$ 47.51	$ 46.24		$ 44.93
Number of Shares Outstanding
Number of Shares Beginning Balance Outstanding	1,556,275	1,725,424		1,875,476
Number of Shares-Granted			[1]		[1]
Number of Shares-Exercised	(186,219)	(141,542)		(146,508)
Number of Shares-Expired or cancelled/forfeited		(27,607)		(3,544)
Number of Shares Ending Balance Outstanding	1,370,056	1,556,275		1,725,424
[1] Stock options were not granted during fiscal 2014, 2013 and 2012.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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