Schedule II - Valuation And Qualifying Accounts (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Allowance for doubtful accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 6,536	$ 7,968	$ 8,307
Net Additions (Reversals) Charged to Expense	1,341	419	1,788
Additions Charged to Other Accounts	0	0	0
Deductions	(2,395)	(1,851)	(2,127)
Balance at End of Period	5,482	6,536	7,968
Allowance for supplier accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	46,078	54,393	74,382
Net Additions (Reversals) Charged to Expense	3,734	5,461	1,623
Additions Charged to Other Accounts	0	0	0
Deductions	(15,139)	(13,776)	(21,612)
Balance at End of Period	34,673	46,078	54,393
Allowance for recoverable taxes [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	29,504	26,044	24,719
Net Additions (Reversals) Charged to Expense	1,855	5,607	4,005
Additions Charged to Other Accounts	0	0	0
Deductions	(8,141)	(2,147)	(2,680)
Balance at End of Period	$ 23,218	$ 29,504	$ 26,044