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Sale of Investment (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 29, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of other assets		$ 2,883	$ 0	$ 2,883	$ 0
Short-term note receivable received in sale of investment				$ 5,738	$ 0
Kingstone Hong Kong | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of ownership interest sold	15.00%
Consideration received	$ 5,700
Short-term note receivable received in sale of investment	$ 5,700

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