Sale of Receivables (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended			3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013	Sep. 30, 2013 Asset-backed Securities Program Number One [Member]	Sep. 30, 2013 Asset Backed Securities Program Number Two [Member]	Sep. 30, 2013 Asset Backed Securities Programs Number Three [Member]
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Trade receivables sold, maximum amount				$ 250,000	$ 35,000	$ 85,000
Receivables sold, face value discounted, percentage	100.00%
Service fee percentage				0.50%
Accounts Receivable, Net Current, Reduction Due to Settlement	2,435	0	12,316
Receivables outstanding in facility	176,481	133,392	156,633
Beneficial interest	35,304	20,989	31,992
Servicing liability	0	0	166
Cash purchase price	322,631	256,747
Deferred purchase price	98,481	118,628
Service fees	175	254
Total	$ 421,287	$ 375,629