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Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Allowance for doubtful accounts [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 2,394 | $ 2,985 | $ 1,783
Net Additions (Reversals) Charged to Expense | 304 | (128) | 1,358
Additions Charged to Other Accounts | 0 | 0 | 0
Deductions | 1,446 | 463 | 156
Balance at End of Period | 1,252 | 2,394 | 2,985
Allowance for supplier accounts [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 16,428 | 18,105 | 21,720
Net Additions (Reversals) Charged to Expense | (5,534) | (937) | (2,339)
Additions Charged to Other Accounts | 0 | 0 | 0
Deductions | 4,145 | 2,614 | 1,276
Balance at End of Period | 17,817 | 16,428 | 18,105
Allowance for recoverable taxes [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 18,778 | 17,181 | 14,679
Net Additions (Reversals) Charged to Expense | 799 | (2,586) | 3,535
Additions Charged to Other Accounts | 0 | 0 | 0
Deductions | 408 | 4,183 | 1,033
Balance at End of Period | $ 19,169 | $ 18,778 | $ 17,181

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