Sale of Receivables (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended							12 Months Ended
	Mar. 31, 2013 Programs	Mar. 31, 2012	Mar. 31, 2013 Asset-backed Securities Program Number One [Member]	Mar. 31, 2012 Asset-backed Securities Program Number One [Member]	Feb. 29, 2012 Asset-backed Securities Program Number One [Member]	Mar. 28, 2013 Asset Backed Securities Program Number Two [Member]	Sep. 28, 2011 Asset Backed Securities Program Number Two [Member]	Mar. 31, 2013 Other Income (Expense) [Member]	Mar. 31, 2013 Selling, General and Administrative Expenses [Member]
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Number of accounts receivable securitiztion programs	3
Receivables sold, face value discounted, percentage	100.00%
Trade receivables sold, maximum amount			$ 250,000		$ 125,000	$ 85,000	$ 35,000
Trade receivables sold, limit increasing fees			2,100	1,545
Service fee percentage			0.50%
Trade and other receivables reduced by net settlement	12,316
Servicing liability, cost								221
Servicing liability reduced during period									55
Receivables outstanding in facility as of March 31:	156,633	182,856
Beneficial interest as of March 31	31,992	25,864
Servicing Liability as of March 31	166	45
Cash purchase price	643,399	638,975
Deferred purchase price	287,027	274,194
Service fees	644	562
Cash proceeds for the twelve months ended March 31: Total	931,070	913,731
Trade receivables sold, cost for entering program								$ 1,220