Share Based Awards (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended				12 Months Ended													12 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009	Mar. 31, 2012 Employee Stock Option [Member] Y	Mar. 31, 2012 Restricted Stock Units Award [Member] Y	Mar. 31, 2011 Restricted Stock Units Award [Member]	Mar. 31, 2010 Restricted Stock Units Award [Member]	Mar. 31, 2012 Employee Option [Member]	Mar. 31, 2011 Employee Option [Member]	Mar. 31, 2010 Employee Option [Member]	Mar. 31, 2012 Director Options [Member]	Mar. 31, 2011 Director Options [Member]	Mar. 31, 2010 Director Options [Member]	May 25, 2011 Performance Based Award [Member]	May 25, 2011 Performance Based Award [Member] Executive Officer [Member]	May 25, 2011 Performance Based Award [Member] Non Executive Employees [Member]	Mar. 31, 2012 Nineteen Ninety Eight Plan [Member]	Sep. 30, 1998 Nineteen Ninety Eight Plan [Member]	Mar. 31, 2012 Two Thousand Five Stock Options Plan [Member]	Mar. 31, 2011 Two Thousand Five Stock Options Plan [Member]	Mar. 31, 2010 Two Thousand Five Stock Options Plan [Member]	Oct. 31, 2005 Two Thousand Five Stock Options Plan [Member]
Share Based Awards (Textual) [Abstract]
Common stock reserved																			8,000,000				4,800,000
Expiration date of options under 1998 Plan																		10 years		10 years
Outstanding options under 1998 and 2005 plan	988,337	1,397,556	1,743,926	1,640,164														46,488		941,849
Shares available for future grants															600,000					3,262,642
Weighted-average grant date fair value of stock options	$ 13.32	$ 9.24	$ 9.65
Annualized forfeiture rate									4.10%	3.60%	1.70%	0.00%	0.00%	0.00%
Options granted under 2005 plan	459,400	110,000	578,968																	459,400	110,000	578,968
Maximum number of options available under the equity incentive program																300,000	300,000
Stock compensation related to the performance based award	$ 616	$ 788	$ 35
Total unrecognized compensation costs					6,053	729
Stock option recognized over weighted average period					3.1	1.7
Fair value of options vested	2,256	2,442	1,732
Restricted units issued						56,960
Compensation expense	$ 3,321	$ 3,748	$ 2,073			$ 540	$ 427	$ 136