Fair Value Disclosures Disclosures related to our financial assets (Details) (Fair Value, Inputs, Level 1 [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost	$ 18,868	$ 16,868
Gross unrecognized holding losses	(35)	0
Available-for-sale marketable securities	18,833	16,868
Fixed Income Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale marketable securities	$ 18,833	$ 16,868