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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Mar. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Schedule of valuation and qualifying accounts
 
    Year Ended March 31,
   
2013
  
2012
  
2011
Allowance for doubtful accounts:
                  
Balance at beginning of period
   $ 5     $ 6     $ 5  
Provision for doubtful accounts
     56       47       48  
Write-off of uncollectible accounts receivable
     (56 )     (48 )     (47 )
                         
Balance at end of year
   $ 5     $ 5     $ 6