Commitments, Contingencies and Leases (Narratives) (Details) BRL in Millions	12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 BRL	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2016 BRL	Mar. 31, 2014 USD ($)	Mar. 31, 2014 BRL
Loss Contingencies [Line Items]
Net rent expense	$ 8,500,000		$ 11,100,000	$ 10,200,000
Non-cancelable purchase commitments	63,700,000
Accrual acquisition liability related to matter before acquisition of Enterasys Networks	2,900,000				BRL 9.4
Foreign
Loss Contingencies [Line Items]
Value of tax credits disallowed						$ 1,000,000	BRL 3.4
Estimated interest and penalties	5,100,000	BRL 16.6
Foreign | Maximum
Loss Contingencies [Line Items]
Potential total tax liability	7,300,000	24.0
Foreign | The State of Sao Paolo, Enterasys Networks do Brazil Ltda.
Loss Contingencies [Line Items]
Estimated court fees	$ 1,200,000	BRL 4.0