Condensed, Consolidating Statement of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 30, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Net income (loss)	$ (24.6)	$ 133.0	$ 124.3	$ (74.0)	$ (15.5)	$ 121.7	$ 125.7	$ (65.7)	$ 158.7	$ 166.2	$ 161.1
Net foreign currency translation adjustment									(14.2)	(8.2)	(5.2)
Net change in derivatives									(2.1)	4.6	5.1
Net change in pension and other post retirement benefits									(4.3)	(4.8)	9.6
Other comprehensive income (loss)									(20.6)	(8.4)	9.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent									(20.6)
Comprehensive income (loss)									138.1	157.8	170.6
Parent
Net income (loss)									161.5	166.2	161.1
Net foreign currency translation adjustment									(14.2)	(8.2)	0.0
Net change in derivatives									(2.1)	4.6	7.2
Net change in pension and other post retirement benefits									(4.3)	(4.8)	0.0
Other comprehensive income (loss)										(8.4)	7.2
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent									(20.6)
Comprehensive income (loss)									140.9	157.8	168.3
Subsidiary Guarantors
Net income (loss)									172.4	179.9	182.6
Net foreign currency translation adjustment									0.0	0.0	0.0
Net change in derivatives									(0.8)	1.3	(2.1)
Net change in pension and other post retirement benefits									(5.4)	0.7	10.6
Other comprehensive income (loss)										2.0	8.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent									(6.2)
Comprehensive income (loss)									166.2	181.9	191.1
Non-Guarantors
Net income (loss)									11.8	22.2	(3.0)
Net foreign currency translation adjustment									(14.2)	(8.2)	(5.2)
Net change in derivatives									0.0	0.0	0.0
Net change in pension and other post retirement benefits									1.1	(5.5)	(1.0)
Other comprehensive income (loss)										(13.7)	(6.2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent									(13.1)
Comprehensive income (loss)									(1.3)	8.5	(9.2)
Consolidation, Eliminations
Net income (loss)									(187.0)	(202.1)	(179.6)
Net foreign currency translation adjustment									14.2	8.2	0.0
Net change in derivatives									0.8	(1.3)	0.0
Net change in pension and other post retirement benefits									4.3	4.8	0.0
Other comprehensive income (loss)										11.7	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent									19.3
Comprehensive income (loss)									$ (167.7)	$ (190.4)	$ (179.6)