Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Component of Other Income (Expense), Nonoperating [Line Items]
Other - net	$ (224)	$ 12,993
Foreign exchange gain (loss)
Component of Other Income (Expense), Nonoperating [Line Items]
Foreign exchange gain (loss)	(2,235)	13,099
Gain (loss) on deferred compensation investments, net
Component of Other Income (Expense), Nonoperating [Line Items]
Gain (loss) on deferred compensation investments, net	1,855	(52)
Other
Component of Other Income (Expense), Nonoperating [Line Items]
Other	$ 156	$ (54)