Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 0.9	$ 65.7	$ 108.5
Other comprehensive loss before reclassifications	(38.7)	(71.9)	(44.7)
Amounts reclassified from accumulated other comprehensive income	(47.8)	7.1	1.9
Ending balance	(85.6)	0.9	65.7
Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	60.2	131.0	158.6
Other comprehensive loss before reclassifications	0.8	(70.8)	(27.6)
Amounts reclassified from accumulated other comprehensive income	(59.4)	0.0	0.0
Ending balance	1.6	60.2	131.0
Unrecognized Loss on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(6.4)	(6.8)	(7.3)
Other comprehensive loss before reclassifications	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive income	0.5	0.4	0.5
Ending balance	(5.9)	(6.4)	(6.8)
Unrecognized Gain (Loss) on Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(52.9)	(58.5)	(42.8)
Other comprehensive loss before reclassifications	(39.5)	(1.1)	(17.1)
Amounts reclassified from accumulated other comprehensive income	11.1	6.7	1.4
Ending balance	$ (81.3)	$ (52.9)	$ (58.5)