Investments - Summary of Gross Unrealized Losses (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months of Unrealized Losses, Estimated Fair Value	$ 6,242	$ 3,223
Less Than 12 Months of Unrealized Losses, Gross Unrealized Losses	(351)	(5)
12 Months or More of Unrealized Losses, Estimated Fair Value	405	7,104
12 Months or More of Unrealized Losses, Gross Unrealized Losses	(69)	(43)
Total, Estimated Fair Value	6,647	10,327
Total, Gross Unrealized Losses	(420)	(48)
U.S Treasury Securities and Agency Bonds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months of Unrealized Losses, Estimated Fair Value	0	300
Less Than 12 Months of Unrealized Losses, Gross Unrealized Losses	0	0
12 Months or More of Unrealized Losses, Estimated Fair Value	0	0
12 Months or More of Unrealized Losses, Gross Unrealized Losses	0	0
Total, Estimated Fair Value	0	300
Total, Gross Unrealized Losses	0	0
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months of Unrealized Losses, Estimated Fair Value	992	2,276
Less Than 12 Months of Unrealized Losses, Gross Unrealized Losses	(2)	(2)
12 Months or More of Unrealized Losses, Estimated Fair Value	0	113
12 Months or More of Unrealized Losses, Gross Unrealized Losses	0	0
Total, Estimated Fair Value	992	2,389
Total, Gross Unrealized Losses	(2)	(2)
Mortgage Backed and Asset Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months of Unrealized Losses, Estimated Fair Value	431	647
Less Than 12 Months of Unrealized Losses, Gross Unrealized Losses	(16)	(3)
12 Months or More of Unrealized Losses, Estimated Fair Value	0	0
12 Months or More of Unrealized Losses, Gross Unrealized Losses	0	(4)
Total, Estimated Fair Value	431	647
Total, Gross Unrealized Losses	(16)	(7)
Closed-end bond funds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months of Unrealized Losses, Estimated Fair Value	4,819	0
Less Than 12 Months of Unrealized Losses, Gross Unrealized Losses	(333)	0
12 Months or More of Unrealized Losses, Estimated Fair Value	405	6,991
12 Months or More of Unrealized Losses, Gross Unrealized Losses	(69)	(39)
Total, Estimated Fair Value	5,224	6,991
Total, Gross Unrealized Losses	$ (402)	$ (39)