Restructuring and Severance Charges - Restructuring Activities and Accrued Liabilities (Details) $ in Millions	6 Months Ended
	Apr. 02, 2017 USD ($)
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 7.5
Provisions	8.2
Cash expenditures	(4.6)
Other non-cash settlement	(0.2)
Ending Balance	11.3
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	2.5
Provisions	7.0
Cash expenditures	(3.0)
Other non-cash settlement	0.0
Ending Balance	6.5
Contract Termination Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	4.6
Provisions	0.4
Cash expenditures	(1.5)
Other non-cash settlement	(0.2)
Ending Balance	3.7
Other Associated Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	0.4
Provisions	0.8
Cash expenditures	(0.1)
Other non-cash settlement	0.0
Ending Balance	$ 1.1