Sale of Receivables (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Receivables sold, face value discounted, percentage	100.00%
Accounts Receivable, Net Current, Reduction Due to Settlement	$ 4,659		$ 12,316
Receivables outstanding in facility	60,774	96,280	156,633
Beneficial interest	21,349	35,368	31,992
Servicing liability	43	9	166
Cash purchase price	80,278	109,475
Deferred purchase price	43,465	63,909
Service fees	93	156
Total	123,836	173,540
Asset-backed Securities Program Number One [Member]
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Trade receivables sold, maximum amount	250,000
Service fee percentage	5.00%
Asset Backed Securities Program Number Two [Member]
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Trade receivables sold, maximum amount	35,000
Asset Backed Securities Programs Number Three [Member]
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Trade receivables sold, maximum amount	$ 85,000