Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands	Sep. 30, 2011	Mar. 31, 2011
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents (1)	$ 125,775	$ 116,617
Restricted cash	2,848	3,787
Marketable securities (2)	1,098	1,120
Total	129,721	121,524
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration related to acquisitions	3,771	13,658
Total	3,771	13,658
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents (1)	125,775	116,617
Restricted cash	2,848	3,787
Marketable securities (2)	1,098	1,120
Total	129,721	121,524
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration related to acquisitions	0	0
Total	0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents (1)	0	0
Restricted cash	0	0
Marketable securities (2)	0	0
Total	0	0
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration related to acquisitions	0	12,743
Total	0	12,743
Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents (1)	0	0
Restricted cash	0	0
Marketable securities (2)	0	0
Total	0	0
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration related to acquisitions	3,771	915
Total	$ 3,771	$ 915

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item 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 Company may deposit additional funds at any time and also 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.

+ References+ Details

- Definition

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