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Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of valuation and qualifying accounts. + References No definition available. + Details
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