Fair Value Measurements (Details) - USD ($)		3 Months Ended	6 Months Ended
		Sep. 30, 2016	Sep. 30, 2016	Mar. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Goodwill, Impairment Loss		$ 282,000,000
LIABILITIES
Fair value of contingent consideration		20,400,000	$ 20,400,000	$ 24,153,000
Increase Decrease in Fair Value Adjustments on Assets and Liabilities Carried at Fair Value			0
Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	26,246,000	26,246,000	27,176,000
Restricted cash and cash equivalents		4,458,000	4,458,000	5,320,000
Marketable securities	[2]			9,297,000
Total		30,704,000	30,704,000	41,793,000
LIABILITIES
Fair value of contingent consideration		20,400,000	20,400,000	23,843,000
Total		20,400,000	20,400,000	23,843,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	26,246,000	26,246,000	27,176,000
Restricted cash and cash equivalents		4,458,000	4,458,000	5,320,000
Marketable securities	[2]			9,297,000
Total		30,704,000	30,704,000	41,793,000
LIABILITIES
Fair value of contingent consideration		0	0	0
Total		0	0	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	0	0	0
Restricted cash and cash equivalents		0	0	0
Marketable securities	[2]			0
Total		0	0	0
LIABILITIES
Fair value of contingent consideration		0	0	0
Total		0	0	0
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	[1]	0	0	0
Restricted cash and cash equivalents		0	0	0
Marketable securities	[2]			0
Total		0	0	0
LIABILITIES
Fair value of contingent consideration		20,400,000	20,400,000	23,843,000
Total		$ 20,400,000	$ 20,400,000	$ 23,843,000

[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.