Business Acquisitions Business Acquisitions Identifiable Intangible Assets Acquired (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			0 Months Ended						12 Months Ended	0 Months Ended	12 Months Ended
	Mar. 31, 2014 Developed Technology [Member]	Mar. 31, 2014 In Process Research and Development [Member]	Mar. 31, 2014 Customer Relationships [Member]	Apr. 18, 2012 Roving Networks Acquisition [Member]	Apr. 18, 2012 Roving Networks Acquisition [Member] Developed Technology [Member]	Apr. 18, 2012 Roving Networks Acquisition [Member] In Process Research and Development [Member]	Apr. 18, 2012 Roving Networks Acquisition [Member] Customer Relationships [Member]	Apr. 18, 2012 Roving Networks Acquisition [Member] Order or Production Backlog [Member]	Feb. 09, 2012 Ident Technology AG acquisition [Member]	Mar. 31, 2014 Ident Technology AG acquisition [Member]	Feb. 09, 2012 Ident Technology AG acquisition [Member] In Process Research and Development [Member]	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Minimum [Member] Roving Networks Acquisition [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Maximum [Member] Roving Networks Acquisition [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Asset, Useful Life (in years)										10 years		1 year	4 years	15 years	10 years
Intangible Asset, Weighted Average Useful Life (in years)	11 years		5 years
Acquired Finite-lived Intangible Asset, Amount	$ 12,700	$ 800	$ 1,300	$ 22,800	$ 10,600	$ 1,300	$ 10,600	$ 300	$ 18,100		$ 8,200