Commitments, Contingencies and Leases (Narratives) (Details)			12 Months Ended
	Jun. 30, 2015 USD ($)	Feb. 03, 2014 defendant	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2014 BRL
Loss Contingencies [Line Items]
Net rent expense			$ 11,100,000	$ 10,200,000	$ 5,900,000
Non-cancelable purchase commitments	$ 69,900,000		$ 69,900,000
Foreign
Loss Contingencies [Line Items]
Value of tax credits disallowed						$ 1,500,000	BRL 3,443,914
Estimated interest and penalties	9,000,000
Potential total tax liability	4,300,000
Foreign | Minimum
Loss Contingencies [Line Items]
Potential total tax liability	0
Foreign | Maximum
Loss Contingencies [Line Items]
Potential total tax liability	$ 9,000,000.0
Commonwealth of Kentucky v. Enterasys Networks Inc and Two Other Defendants | Pending Litigation
Loss Contingencies [Line Items]
Number of co-defendants | defendant		2