Business combinations (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended						0 Months Ended	3 Months Ended	6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2013 Senior Secured Credit Facilities	Oct. 31, 2013 Term Loan	Dec. 31, 2013 Revolving Facility	Oct. 31, 2013 Revolving Facility	Oct. 31, 2013 Enterasys Networks, Inc.	Dec. 31, 2013 Enterasys Networks, Inc.	Dec. 31, 2013 Enterasys Networks, Inc.	Dec. 31, 2013 Enterasys Networks, Inc. In-process research and development
Business Acquisition [Line Items]
Purchase price paid in acquisition			$ 180,000,000	$ 0					$ 180,000,000
Borrowing capacity					125,000,000	65,000,000		60,000,000
Amount outstanding on revolving credit facility							35,000,000
Fair value of indefinite lived intangibles												3,000,000
Acquiree actual revenue											70,100,000
Acquiree actual operating income											1,200,000
Acquisition and integration costs	$ 8,688,000	$ 0	$ 12,382,000	$ 0						$ 2,100,000	$ 5,800,000