Schedule II - Valuation And Qualifying Accounts (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Allowance for doubtful accounts [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 2,985	$ 1,783	$ 3,947
Net Additions (Reversals) Charged to Expense	(128)	1,358	(2,006)
Additions Charged to Other Accounts	0	0	0
Deductions	(463)	(156)	(158)
Balance at End of Period	2,394	2,985	1,783
Allowance for supplier accounts [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	18,105	21,720	27,074
Net Additions (Reversals) Charged to Expense	937	(2,339)	3,730
Additions Charged to Other Accounts	0	0	0
Deductions	(2,614)	(1,276)	(9,084)
Balance at End of Period	16,428	18,105	21,720
Allowance for recoverable taxes [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	17,181	14,679	12,552
Net Additions (Reversals) Charged to Expense	(2,586)	3,535	1,732
Additions Charged to Other Accounts	0	0	0
Deductions	4,183	(1,033)	395
Balance at End of Period	$ 18,778	$ 17,181	$ 14,679