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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 23, 2019
Feb. 24, 2018
Feb. 23, 2019
Feb. 24, 2018
Aug. 25, 2018
Effective income tax rate 24.90% (34.00%) 25.50% 4.20%  
Percentage of domestic federal statutory tax rate     21.00% 25.90%  
Transition tax         $ 2.5
Deferred tax reduction       $ 22.7 22.6
Provisional net benefit         $ 20.1
Maximum [Member]          
Percentage of domestic federal statutory tax rate     35.00%    
Minimum [Member]          
Percentage of domestic federal statutory tax rate     21.00%