Business Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jul. 17, 2014
Business Acquisition [Line Items]
Amount of cash paid, net of cash and short-term investments acquired	$ 0	$ 375,365
ISSC Technologies Corporation [Member]
Business Acquisition [Line Items]
Ownership interest acquired in ISSC tender offer			83.50%