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Restructuring - Schedule of Restructuring Charges and Cash Payments (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Restructuring Cost And Reserve [Line Items]    
Accrued restructuring balance $ 199 $ 974
Charges to operations 764 143
Cash payments (636) (815)
Other adjustments (196)  
Accrued restructuring balance 131 302
Severance Pay and Benefits
    
Restructuring Cost And Reserve [Line Items]    
Accrued restructuring balance 145 680
Charges to operations 751 182
Cash payments (599) (560)
Other adjustments (166)  
Accrued restructuring balance 131 302
Facility Exit Costs
    
Restructuring Cost And Reserve [Line Items]    
Accrued restructuring balance 54 294
Charges to operations 13 (39)
Cash payments (37) (255)
Other adjustments $ (30)