Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Dec. 26, 2015	Dec. 27, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 84.9	$ 29.2
Changes in foreign currency translation adjustment	(4.2)	(9.0)
Changes in unrealized holding gains and losses on available-for-sale securities:	(0.6)	5.1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(7.2)	0.0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	0.0	0.1
Changes in value of hedged interest rate caps, net of tax of $0.2:	0.3	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0.3	0.0
Other comprehensive loss	(11.4)	(3.8)
Comprehensive income	$ 73.5	$ 25.4