Fair Value Disclosures Disclosures related to our financial assets (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Aug. 31, 2013	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Jul. 31, 2015	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in receivables			$ 5,028	$ 2,747
Fair Value, Inputs, Level 1 [Member]
Available-for-sale marketable securities
Amortized cost			72,934			$ 80,522
Gross unrecognized holding losses			(472)			(204)
Fair value			72,462			80,318
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale marketable securities			72,462			80,318
iTVX, Inc. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability					$ 500	4,500
Contingent consideration earnout period in years	2 years
Contingent consideration percentage of payment paid in cash	25.00%
Contingent consideration percentage of payment paid in stock	75.00%
Fair value remeasurement of contingent consideration liability		$ (4,000)
Change in receivables		(300)
iTVX, Inc. [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	$ 2,000		$ 0			$ 4,500
Selling, General and Administrative Expenses [Member] | iTVX, Inc. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value remeasurement of contingent consideration liability		$ (3,700)