Acquisitions (Fair Value Of Acquired Identifiable Intangible Assets And Related Estimates Useful Lives) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2011
Simena [Member]
Business Acquisition [Line Items]
Fair Value	$ 4,470
Simena [Member] | Acquired Technology [Member]
Business Acquisition [Line Items]
Fair Value	2,740
Useful Life (Years)	10
Simena [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Fair Value	1,730
Useful Life (Years)	10
Replay [Member]
Business Acquisition [Line Items]
Fair Value	4,950
Replay [Member] | Acquired Software [Member]
Business Acquisition [Line Items]
Fair Value	1,100
Useful Life (Years)	6
Replay [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Fair Value	1,400
Useful Life (Years)	10
Replay [Member] | Core Technology [Member]
Business Acquisition [Line Items]
Fair Value	2,100
Useful Life (Years)	10
Replay [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Fair Value	350
Useful Life (Years)	3
Psytechnics [Member]
Business Acquisition [Line Items]
Fair Value	4,350
Psytechnics [Member] | Acquired Software [Member]
Business Acquisition [Line Items]
Fair Value	1,200
Useful Life (Years)	5
Psytechnics [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Fair Value	450
Useful Life (Years)	10
Psytechnics [Member] | Core Technology [Member]
Business Acquisition [Line Items]
Fair Value	$ 2,700
Useful Life (Years)	10