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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 03, 2018
Aug. 31, 2019
Dec. 31, 2018
Sep. 01, 2018
Dec. 31, 2017
Sep. 02, 2017
Sep. 03, 2016
Unrecognized tax benefits related to tax positions       $ 1,217      
Provision for income taxes, interest and penalties       44   $ 245 $ 6
Accrued interest and penalties on income taxes       447   $ 305  
Tax credit carryforward       2,712      
Tax credit carryforward, valuation allowance       $ 1,762      
U.S. federal statutory rate       25.60% 35.00% 35.00% 35.00%
Net tax benefit, revaluation of deferred tax liabilities $ 41,199     $ 40,464      
Scenario, Plan [Member]              
U.S. federal statutory rate   21.00% 21.00%