Quarterly Financial Information (Unaudited) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended			3 Months Ended
	Mar. 29, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013	Jun. 30, 2012	Mar. 30, 2013 NSE's Speed Wireline Product Line Exit	Mar. 30, 2013 NSE's Speed Wireline Product Line Exit	Mar. 30, 2013 NSE's Speed Wireline Product Line Exit Acquired developed technology	Mar. 30, 2013 NSE's Speed Wireline Product Line Exit Other
Quarterly Financial Information (Unaudited)
Insurance claims recorded as other income in Interest and other income (expense), net					$ 9.4
Amortization expenses			59.0	76.0	80.3		2.2	1.8	0.4
Write-downs of inventories						11.3
Deferred tax valuation allowance release		107.9		107.9
Uncertain tax benefits related to deferred tax assets due to the expiration of the statute of limitations in a non-US jurisdiction	$ 21.7