Restructuring and Severance Charges - Additional Information (Details) $ in Millions	9 Months Ended
	Jul. 02, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Net provisions for restructuring costs	$ 19.4
Employee Severance
Restructuring Cost and Reserve [Line Items]
Net provisions for restructuring costs	11.9
Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Net provisions for restructuring costs	$ 6.6