Fair Value Measurements (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Mar. 31, 2015
LIABILITIES
Fair value of contingent consideration		$ 7,956	$ 9,124
Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	98,647	118,993
Restricted cash and cash equivalents		3,982	2,419
Marketable securities	[2]	12,130	11,592
Total		114,759	133,004
LIABILITIES
Fair value of contingent consideration		7,698	16,155
Total		7,698	16,155
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	98,647	118,993
Restricted cash and cash equivalents		3,982	2,419
Marketable securities	[2]	12,130	11,592
Total		114,759	133,004
LIABILITIES
Fair value of contingent consideration		0	0
Total		0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	0	0
Restricted cash and cash equivalents		0	0
Marketable securities	[2]	0	0
Total		0	0
LIABILITIES
Fair value of contingent consideration		0	0
Total		0	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	0	0
Restricted cash and cash equivalents		0	0
Marketable securities	[2]	0	0
Total		0	0
LIABILITIES
Fair value of contingent consideration		7,698	16,155
Total		$ 7,698	$ 16,155

[1] Cash equivalents consist of money market funds.

[2] Marketable securities consist of available-for-sale money market instruments and fixed-income securities, including certificates of deposit, corporate bonds and notes, and municipal securities.