Business combinations (Schedule of Finite-Lived Intangible Assets Acquired) (Details) (USD $) In Thousands, unless otherwise specified									0 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013 Developed technology	Dec. 31, 2013 Customer relationships	Dec. 31, 2013 Maintenance contracts	Dec. 31, 2013 Trademarks	Dec. 31, 2013 Order backlog	Oct. 31, 2013 Enterasys Networks, Inc.	Oct. 31, 2013 Enterasys Networks, Inc. Developed technology	Oct. 31, 2013 Enterasys Networks, Inc. Customer relationships	Oct. 31, 2013 Enterasys Networks, Inc. Maintenance contracts	Oct. 31, 2013 Enterasys Networks, Inc. Trademarks	Oct. 31, 2013 Enterasys Networks, Inc. Order backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life									3 years	3 years	5 years	3 years	1 year 6 months
Amount	$ 121,806	$ 12,906	$ 45,000	$ 37,000	$ 17,000	$ 2,500	$ 7,400	$ 108,900	$ 45,000	$ 37,000	$ 17,000	$ 2,500	$ 7,400