Fair Value Measurements Cash, Cash Equivalents and Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Dec. 31, 2014	Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
CashCashEquivalentsAndShortTermInvestmentsAmortizedCost	$ 8,013	$ 28,999
CashCashEquivalentsAndShortTermInvestmentsUnrealizedLosses	0
Cash, Cash Equivalents, and Short-term Investments	8,013	28,999
Cash Equivalents, at Carrying Value	2,998us-gaap_CashEquivalentsAtCarryingValue	28,999us-gaap_CashEquivalentsAtCarryingValue
Available-for-sale Securities, Current	5,015
Fair Value, Inputs, Level 2 [Member] \| Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
CashCashEquivalentsAndShortTermInvestmentsAmortizedCost		9,006
Cash, Cash Equivalents, and Short-term Investments		9,006
Cash Equivalents, at Carrying Value		9,006
Fair Value, Inputs, Level 2 [Member] \| Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
CashCashEquivalentsAndShortTermInvestmentsAmortizedCost	2,998	19,993
Cash, Cash Equivalents, and Short-term Investments	2,998	19,993
Cash Equivalents, at Carrying Value	2,998	19,993
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
CashCashEquivalentsAndShortTermInvestmentsAmortizedCost	5,015
CashCashEquivalentsAndShortTermInvestmentsUnrealizedLosses	0
Cash, Cash Equivalents, and Short-term Investments	5,015
Available-for-sale Securities, Current	$ 5,015

- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

+ References+ Details