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Share-based Compensation - Additional Information Related to Stock Options (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 2,057 $ 2,896 $ 2,812
Proceeds from stock options exercised 67 210 0
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 0 0 150
Proceeds from stock options exercised 67 210 0
Total intrinsic value of stock options exercised 382 2,070 158
Total fair value of stock options vesting $ 0 $ 0 $ 532