Sale of Receivables (Details) (USD $)	6 Months Ended
	Sep. 30, 2014 program	Sep. 30, 2013	Mar. 31, 2014	Mar. 31, 2013
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Number of accounts receivable securitization programs	3
Receivables sold, face value discounted, percentage	100.00%
Reductions of trade and other receivables due to settlements	$ 4,300,000		$ 16,575,000	$ 2,435,000
Receivables outstanding in facility	169,037,000	176,481,000	204,364,000
Beneficial interest	35,252,000	35,304,000	35,559,000
Servicing liability	21,000	0	69,000
Cash purchase price	207,940,000	322,631,000
Deferred purchase price	86,569,000	98,481,000
Service fees	275,000	175,000
Total	294,784,000	421,287,000
Asset-backed Securities Program Number One [Member]
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Trade receivables sold, maximum amount	250,000,000
Service fee percentage	0.50%
Asset Backed Securities Program Number Two [Member]
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Trade receivables sold, maximum amount	35,000,000
Asset Backed Securities Programs Number Three [Member]
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Trade receivables sold, maximum amount	$ 100,000,000