Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	2 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Aug. 30, 2016	Jul. 02, 2016	Jul. 02, 2016	Jul. 02, 2016
Share Repurchase Agreement February 2016
Subsequent Event [Line Items]
Shares delivered and retired (in shares)		0.7
Average repurchase price per share (in dollars per share)		$ 6.60
Marketable equity investments
Subsequent Event [Line Items]
Number of equity securities sold (in security)				(4.5)
Gross realized gain (loss)			$ 71.5
Marketable equity investments | Lumentum
Subsequent Event [Line Items]
Number of equity securities sold (in security)				4.5
Subsequent Event | Share Repurchase Agreement February 2016
Subsequent Event [Line Items]
Shares delivered and retired (in shares)	1.4
Average repurchase price per share (in dollars per share)	$ 7.50
Subsequent Event | Lumentum
Subsequent Event [Line Items]
Gross proceeds	$ 71.6
Subsequent Event | Marketable equity investments | Lumentum
Subsequent Event [Line Items]
Number of equity securities sold (in security)	2.7
Gross realized gain (loss)	$ 48.9