Restructuring and Related Costs (Summary Of Severance Charges On Balance Sheet) (Details) - USD ($) $ in Thousands	Apr. 01, 2017	Oct. 01, 2016
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	$ 2,159	$ 2,296
Accrued Payroll And Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	1,171	1,066
Other Long-Term Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	517	710
Employee Severance [Member] | Defined Benefit Pension Plan Obligation [Member]
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	$ 471	$ 520