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Discontinued Operations (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2019
Jul. 01, 2018
Apr. 01, 2018
Jul. 02, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale   $ 4,000,000   $ 68,448,000
Post-closing adjustments       1,448,000
Cash provided by (used in) operating activities of discontinued operations $ 0   $ (353,000)  
Cash provided by (used in) investing activities related to discontinued operations $ 598,000   $ 1,925,000  
Original lease agreement [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Term of lease 10 years      
Amended lease agreement [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Term of lease 14 years      
Lease renewal period 3 years      
Discontinued Operations Held-for-sale [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on divestiture, net   $ 0   $ 11,413,000
Discontinued Operations Held-for-sale [Member] | Original lease agreement [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Total annual lease payments $ 1,288,000      
Discontinued Operations Held-for-sale [Member] | Current twelve month estimate [Member] | Amended lease agreement [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Total annual lease payments $ 1,755,000      
Minimum [Member] | Amended lease agreement [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Early termination term 5 years      
Maximum [Member] | Amended lease agreement [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Early termination term 10 years