Share-based Compensation (Narratives) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Oct. 31, 2013 Enterasys Networks, Inc.	Mar. 31, 2014 1999 Employee Stock Purchase Plan	Mar. 31, 2013 1999 Employee Stock Purchase Plan	Mar. 31, 2014 1999 Employee Stock Purchase Plan	Mar. 31, 2013 1999 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 2.71	$ 1.72	$ 2.39	$ 2.71		$ 1.62	$ 0.86	$ 1.44	$ 0.88
Options granted			6,097		4,200
Options granted, weighted average exercise price (in dollars per share)			$ 5.22		$ 5.30
Restricted stock units granted			5,037		2,700
Restricted stock units granted, grant-date fair value (in dollars per share)			$ 5.56		$ 5.30