Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock-Based Compensation (Textual) [Abstract]
Compensation cost related to stock options & RSUs recognized in operating results			$ 914,000	$ 956,000
2004 Equity Compensation Plan [Member]
Stock-Based Compensation (Textual) [Abstract]
Stock option plan			2004 Plan
Term of grant			Not more than 10 years
Percentage of stock option exercisable per year			25.00%
Outstanding RSUs vesting percentage			50.00%
Reduction in number of shares of Company's common stock authorized for issuance			500,000
Issue of common stock under ESOP			1,500,000
Company's common stock could be issued as grants			2,000,000
Shares available for grant	762,370		762,370
Weighted average fair value of stock options granted			$ 7.27	$ 6.88
Weighted average fair value of restricted stock granted			$ 14.78	$ 16.25
2011 Stock Option Plan for Non-Employee Directors [Member]
Stock-Based Compensation (Textual) [Abstract]
Stock option plan			2011 Plan
Percentage of stock option exercisable per year			25.00%
Shares available for grant	134,000		134,000
Non-qualified stock options available for grant	150,000		150,000
Company's common stock granted to non-employee director			4,000
Expiry period of option			5 years
Total unrecognized compensation cost related to non-vested stock option awards	1,589,000		1,589,000
Equity incentive plan recognized over a weighted average period			2 years 10 months 24 days
Compensation cost related to stock options & RSUs recognized in operating results	504,000	493,000	914,000	956,000
2011 Stock Option Plan for Non-Employee Directors [Member] | Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation (Textual) [Abstract]
Total unrecognized compensation cost related to non-vested stock option awards	$ 2,105,000		$ 2,105,000
Equity incentive plan recognized over a weighted average period			2 years 6 months