Other Income (Expense), Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ 9,832	$ (4,515)	$ (1,726)
Foreign exchange gain (loss)
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	4,656	(6,310)	(1,396)
Gain (loss) on deferred compensation investments, net (Note 12)
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	4,955	1,738	(351)
Other
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ 221	$ 57	$ 21