Restructuring and Severance Charges - Additional Information (Details) $ in Millions	3 Months Ended
	Jan. 01, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Net provisions for restructuring costs	$ 2.4
Employee Severance
Restructuring Cost and Reserve [Line Items]
Net provisions for restructuring costs	2.3
Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Net provisions for restructuring costs	$ 0.1