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Schedule II - Valuation And Qualifying Accounts (Details) (USD $)
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Allowance For Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 5,603 $ 6,857 $ 6,037
Net Additions (Reversals) Charged to Expense 4,244 (681) 697
Additions Charged to Other Accounts 0 0 0
Deductions (1,540) (573) 123
Balance at End of Period 8,307 5,603 6,857
Allowance For Supplier Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 74,938 56,243 28,164
Net Additions (Reversals) Charged to Expense 11,929 18,666 18,514
Additions Charged to Other Accounts 0 0 0
Deductions (12,485) 29 9,565
Balance at End of Period 74,382 74,938 56,243
Allowance For Recoverable Taxes [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 22,126 17,593 12,257
Net Additions (Reversals) Charged to Expense 2,564 3,785 3,174
Additions Charged to Other Accounts 0 0 0
Deductions 29 748 2,162
Balance at End of Period $ 24,719 $ 22,126 $ 17,593