Cash and Cash Equivalents	12 Months Ended
Cash and Cash Equivalents	Mar. 31, 2011
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	3. Cash and Cash Equivalents At March 31, 2011 and 2010, the Company had cash and cash equivalents of $116,617 and $84,611, respectively. Cash and cash equivalents consist of cash, money market funds and short-term U.S. Treasury securities with original maturities of less than 90 days. The money market fund in which the Company holds a portion of its cash invests in only investment grade money market instruments from a variety of industries, and therefore bears relatively low market risk. The average maturity of the investments owned by the money market fund is approximately two months.

The entire cash and cash equivalents footnote disclosure, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.

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