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Income Tax (Summary of Income Tax Contigencies) (detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Tax Uncertainties [Abstract]    
Beginning Balance $ 2,350 $ 2,174
Additions 176 207
Prior year additions 70 133
Reductions (45) (27)
Settlements (81) (137)
Lapses in statues of limitaions   0
Ending Balance $ 2,470 $ 2,350