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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Allowance for Doubtful Accounts Receivable      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance, Beginning of Year $ 54 $ 16  
Additions   54 $ 16
Write-offs   (16)  
Balance, End of Year 54 54 16
Deferred Tax Asset Valuation Allowance      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance, Beginning of Year 294,860 282,824 261,961
Additions 9,028 15,189 26,649
Write-offs (2,495) (3,153) (5,786)
Balance, End of Year $ 301,393 $ 294,860 $ 282,824