Discontinued Operations (Details) - USD ($) $ in Thousands			12 Months Ended
	Oct. 21, 2016	Oct. 23, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Oct. 23, 2017	Oct. 23, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Future minimum lease payments			$ 3,922
San Francisco
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Future minimum lease payments			100
Etherios, Inc. | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payment received from sale agreement		$ 4,096
Facility abandonment costs		$ 725
Income tax benefit on discontinued operations			$ (476)	$ (1,627)	$ (1,522)
Etherios, Inc. | Discontinued Operations, Disposed of by Sale | United States Federal Tax Jurisdiction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred income tax liability				$ 589
Etherios, Inc. | Discontinued Operations, Disposed of by Sale | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration receivable						$ 2,000	$ 3,000
Subsequent Event | Etherios, Inc. | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payment received from sale agreement	$ 3,000