Credit Facility (Details) (USD $) In Millions, unless otherwise specified				6 Months Ended		6 Months Ended	0 Months Ended
	Sep. 30, 2014 Credit facility	Mar. 31, 2014 Credit facility	Oct. 31, 2008 Credit facility	Sep. 30, 2014 Revolving Line of Credit	Oct. 31, 2008 Revolving Line of Credit	Sep. 30, 2014 Revolving Line of Credit Maximum	Oct. 31, 2008 Bank Term Note	Oct. 31, 2008 Bank Term Note
Revolving Line of Credit
Maximum borrowing capacity			$ 19.5		$ 12.0
Term of debt instrument				2 years			48 months
Principal amount								7.5
Prime rate at the end of the period (as a percent)				3.25%
Monthly interest rate basis						prime rate
Basis points added to reference rate (as a percent)						0.25%
Unused line fee (as a percent)				0.25%
Amount outstanding	$ 0	$ 0