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Accumulated Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 29, 2020
Feb. 23, 2019
Feb. 29, 2020
Feb. 23, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     $ (491)  
OCI before reclassifications $ 0   (68)  
OCI before reclassifications   $ (634)   $ (656)
Amounts reclassified from AOCI 8 8 16 16
Net current-period OCI 8 (626) (52) (640)
Balance at end of period (543)   (543)  
Defined Benefit Pension Items        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period (551) (583) (559) (591)
OCI before reclassifications   0  
OCI before reclassifications   0   0
Amounts reclassified from AOCI 8 8 16 16
Net current-period OCI 8 8 16 16
Balance at end of period (543) (575) (543) (575)
Interest Rate Swap        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period 0 1,461 68 1,483
OCI before reclassifications 0   (68)  
OCI before reclassifications   (634)   (656)
Amounts reclassified from AOCI 0 0 0 0
Net current-period OCI 0 (634) (68) (656)
Balance at end of period 0 827 0 827
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period (551) 878 (491) 892
OCI before reclassifications   (634)   (656)
Balance at end of period $ (543) $ 252 $ (543) $ 252