Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 29.4	$ 11.3	$ 106.5	$ (10.8)
Changes in foreign currency translation adjustment	4.5	3.3	(14.0)	(3.7)
Changes in unrealized holding gains and losses on available-for-sale securities	(0.7)	4.2	(3.9)	2.0
Changes in pension plans, net of taxes of $0.2 in fiscal 2014			0.1	(0.6)
Changes in value of hedged interest rate caps, net of tax of $0.5 and $1.4 for the three and nine months ended June 27, 2015	(0.7)	0.0	(2.3)	0.0
Other comprehensive income (loss)	3.1	7.5	(20.1)	(2.3)
Comprehensive income (loss)	$ 32.5	$ 18.8	$ 86.4	$ (13.1)