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Capitalized Software Costs (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Capitalized software development costs      
Gross carrying amount $ 65,221 $ 52,123  
Accumulated amortization (45,227) (36,973)  
Net capitalized software costs $ 19,994 $ 15,150 $ 11,546