Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Income tax expense	$ 9,761,000	$ 10,967,000	$ 11,963,000
Additions to valuation allowance	14,900,000		17,500,000
Foreign earnings repatriated		100,000,000
Net impact to fiscal 2017 opening retained earnings balance	0
Increase to valuation allowance	20,700,000
Aggregate undistributed earnings of foreign subsidiaries for which deferred income tax liability has not been recorded	990,700,000
Uncertain tax benefits	3,100,000
Unrecognized tax benefits that would reduce company's effective tax rate if recognized	800,000	600,000
Total accrued penalties and net accrued interest with respect to income taxes	200,000	200,000	200,000
Expense recognized for accrued penalties and net accrued interest (less than)	100,000	100,000	100,000
Other liabilities (noncurrent)
Uncertain tax benefits	800,000
Deferred income taxes (noncurrent asset)
Uncertain tax benefits	2,300,000
State Jurisdiction
Net operating loss carryforwards	181,500,000
AMER
Increase to valuation allowance	18,400,000
EMEA
Increase to valuation allowance	2,300,000
APAC
Tax reductions related to tax holiday	$ 37,500,000	$ 27,100,000	$ 29,900,000
Tax reductions related to tax holiday, basic (in dollars per share)	$ 1.11	$ 0.81	$ 0.89
Tax reductions related to tax holiday, diluted (in dollars per share)	$ 1.08	$ 0.79	$ 0.87
Accounting Standards Update 2016-09
Net operating loss carryforwards		$ 4,900,000
Increase to valuation allowance		4,900,000
Accounting Standards Update 2016-09 | Retained Earnings
Net impact to fiscal 2017 opening retained earnings balance		$ 0