Share Based Awards (Details 5) (Restricted Stock Units Award [Member], USD $)	12 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Restricted Stock Units Award [Member]
Restricted stock units award activity
Shares Outstanding, beginning balance	22,896	16,000	0
Weighted average Grant Date Fair value Per Share, Beginning of the year	$ 27.09	$ 26.93	$ 0.00
Number of Shares Granted	22,668	18,292	16,000
Weighted average Grant Date Fair value Per Share, Granted	$ 39.75	$ 27.31	$ 26.93
Number of Shares Vested	(15,563)	(11,396)
Weighted average Grant Date Fair value Per Share, Vested	$ 27.51	$ 27.22
Shares Outstanding, ending balance	30,001	22,896	16,000
Weighted average Grant Date Fair value Per Share Outstanding, Ending of the year	$ 36.32	$ 27.09	$ 26.93

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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