Restructuring And Related Costs (Summary Of Severance Charges On Balance Sheet) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	$ 3,962	$ 2,296	$ 1,548
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	3,962	2,296
Employee Severance [Member] | Accrued Payroll And Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	3,485	1,066
Employee Severance [Member] | Other Accrued Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	98	520
Employee Severance [Member] | Other Long-term Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Total severance and related costs	$ 379	$ 710