Indebtedness (Money Market Loans Narrative) (Details) (USD $)	12 Months Ended
	Mar. 31, 2013
Agreement Expiring In January 2014 [Member]
Debt Instrument [Line Items]
Money market loans maximum amount allowed	$ 35,000,000
Money market advances agreement expiration	January 1, 2014
Money market loans, terms	one to six months with rates at a fixed spread over the corresponding London Interbank Offering Rate (“LIBOR”)
Short-term advances outstanding	0
Agreement Expiring In July 2013 [Member]
Debt Instrument [Line Items]
Money market loans maximum amount allowed	35,000,000
Money market advances agreement expiration	July 31, 2013
Money market loans, terms	generally overnight or for up to seven days
Short-term advances outstanding	$ 0
Maximum [Member] | Agreement Expiring In January 2014 [Member]
Debt Instrument [Line Items]
Short term debt maturity period	6 months
Maximum [Member] | Agreement Expiring In July 2013 [Member]
Debt Instrument [Line Items]
Short term debt maturity period	7 days
Minimum [Member] | Agreement Expiring In January 2014 [Member]
Debt Instrument [Line Items]
Short term debt maturity period	1 month