Summary of Significant Accounting Policies and Change in Accounting Principles Summary of Significant Accounting Policies and Change in Accounting Principles (Details 1) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended			3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014 segments	Mar. 30, 2013	Jun. 29, 2013	Mar. 29, 2014 Prothena [Member]	Dec. 18, 2013 Prothena [Member]	Mar. 29, 2014 Transition Therapeutics [Member]	Mar. 29, 2014 Janssen AI [Member]	Mar. 29, 2014 Janssen AI [Member]	Dec. 18, 2013 Janssen AI [Member]	Mar. 29, 2014 Newbridge [Member]	Mar. 29, 2014 Newbridge [Member]	Mar. 29, 2014 Proteostatis [Member]	Mar. 29, 2014 Proteostatis [Member]
Investments [Line Items]
Number of Reportable Segments			5
Investment, Ownership Percentage							14.60%				49.90%	48.00%	48.00%	22.00%	22.00%
Total marketable securities at fair value	$ 25.6		$ 25.6
Marketable securities, current	7.7		7.7		0
Marketable Securities, Noncurrent	17.9		17.9					15.0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	8.4		3.5
Non-marketable cost method investments, non-current	8.9		8.9
Proceeds from Sale of Securities			81.4	8.6		79.4
Loss on sales of investments	(12.7)	(1.6)	(12.7)	(4.7)		(9.9)			(2.8)
Investment Owned, Balance, Shares								2,255,640
Equity method investments	60.6		60.6		4.4							37.2	37.2	19.3	19.3
Proceeds from Sale of Equity Method Investments									(2.0)
Net loss from equity method investments									(0.6)	(1.6)		(0.6)	(2.8)	(2.6)	(0.7)
Option to purchase remaining equity in joint venture												$ 243.0	$ 243.0