Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2012

Fair Value Disclosures [Abstract]

Fair value of assets and liabilities on a recurring basis

The following tables set forth by level within the fair value hierarchy the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at September 30, 2012 and March 31, 2012:

	Balance at		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
	September 30, 2012
ASSETS
Cash and cash equivalents (1)	$	117,043	$	117,043	$	—	$	—
Restricted cash	5,223		5,223		—		—
Marketable securities (2)	4,989		4,989		—		—
	$	127,255	$	127,255	$	—	$	—
LIABILITIES
Contingent consideration related to acquisitions	$	9,339	$	—	$	—	$	9,339
	$	9,339	$	—	$	—	$	9,339

	Balance at		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
	March 31, 2012
ASSETS
Cash and cash equivalents (1)	$	134,444	$	134,444	$	—	$	—
Restricted cash	1,962		1,962		—		—
Marketable securities (2)	4,987		4,987		—		—
	$	141,393	$	141,393	$	—	$	—
LIABILITIES
Contingent consideration related to acquisitions	$	6,556	$	—	$	—	$	6,556
	$	6,556	$	—	$	—	$	6,556

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(1) Cash equivalents consists of money market funds.

(2) Marketable securities consist of fixed-income securities.

Company's assets and liabilities measured at fair value using significant unobservable inputs (Level 3)

The following table presents activity in the Company’s financial assets and liabilities measured at fair value using significant unobservable inputs (Level 3), as of and for the six months endedSeptember 30, 2012:

	Total Liabilities
Balance as of April 1, 2012	$	6,556
Acquisitions (Note 3)	2,862
Earnout payments	(935		)
Fair value adjustments	856
Balance as of September 30, 2012	$	9,339