Accounts Receivable Discount Programs (Details) (USD $)	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Accounts Receivable Discount Programs [Abstract]
Receivables discounted	$ 100,076,000	$ 98,974,000
Weighted average days	335 days	338 days
Annualized weighted average discount rate (in hundredths)	2.40%	2.70%
Amount of discount as interest expense	$ 2,188,000	$ 2,534,000