Interest Rates and Company Borrowings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Interest and debt expense:
Weighted average interest rate during the year	1.10%	1.25%	1.73%
Interest rate at year end	1.78%	0.00%	1.74%
Maximum amount outstanding during the year	$ 89,632	$ 48,920	$ 38,920
Average amount outstanding during the year	18,658	18,707	24,494
Facility fees	$ 301	$ 449	$ 521