Restructuring and Related Costs (Summary Of Severance Charges On Balance Sheet) (Details) - USD ($) $ in Thousands	Jul. 01, 2017	Oct. 01, 2016
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	$ 1,099	$ 2,296
Accrued payroll and related costs
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	546	1,066
Other long-term liabilities
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	455	710
Employee severance | Other accrued liabilities
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	$ 98	$ 520