Business combinations (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended	9 Months Ended				0 Months Ended			3 Months Ended	9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Oct. 31, 2013 Term Loan	Oct. 31, 2013 Revolving Facility	Mar. 31, 2014 Enterasys Networks, Inc.	Dec. 31, 2013 Enterasys Networks, Inc.	Oct. 31, 2013 Enterasys Networks, Inc.	Mar. 31, 2013 Enterasys Networks, Inc.	Mar. 31, 2014 Enterasys Networks, Inc.	Mar. 31, 2013 Enterasys Networks, Inc.	Mar. 31, 2014 Enterasys Networks, Inc. In-process research and development
Business Acquisition [Line Items]
Purchase price paid in acquisition				$ 180,000,000	$ 0			$ 180,000,000	$ 180,000,000	$ 180,000,000
Borrowing capacity						65,000,000	60,000,000
Increase (decrease) in net income (loss)			(400,000)
Net income (loss), including measurement period adjustments			(16,400,000)								(21,166,000)	(63,410,000)	(35,999,000)
Fair value of indefinite lived intangibles														3,000,000
Acquiree actual revenue												148,300,000
Acquiree actual operating income												27,500,000
Acquisition and integration costs	$ 6,443,000	$ 0		$ 18,826,000	$ 0							$ 5,900,000