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Retirement Plans (Narrative) (Details) - USD ($)
 12 Months Ended
Jan. 01, 2016
Sep. 29, 2019
Sep. 30, 2018
Oct. 01, 2017
Defined Benefit Plan Disclosure [Line Items]        
Decrease in earnings before income taxes due to quarter percentage point decrease in discount rate   $ 500,000    
Decrease in earnings before income taxes due to quarter percentage point decrease in long-term rate of return   1,100,000    
Minimum required contribution for retirement plans   $ 0    
Qualified Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Estimated participation rate in limited lump sum payment program for terminated employees   40.00%    
Reduction in Company's PBO from limited lump sum payment program for terminated employees   $ 25,600,000    
Qualified Defined Contribution Plan        
Defined Benefit Plan Disclosure [Line Items]        
Minimum age of eligible employees   21 years    
Employer matching contribution, percent of match 100.00%      
Employer matching contribution, percent of employees' gross pay 4.00%      
Defined contribution plan, Company contributions   $ 1,700,000 $ 2,200,000 $ 1,900,000
Non-Qualified Deferred Compensation Plan        
Defined Benefit Plan Disclosure [Line Items]        
Employer matching contribution, percent of employees' gross pay   4.00%    
Defined contribution plan, Company contributions   $ 200,000 $ 200,000 $ 500,000
Maximum annual contributions per employee, percent   50.00%    
Maximum annual contributions per employee, percent of bonus   85.00%    
Period of years in executive position   10 years