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Contingent Liabilites and Commitments (Lease Commitments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Aug. 25, 2018
Aug. 26, 2017
Business Acquisition, Contingent Consideration [Line Items]      
Lease expense $ 6,200 $ 4,400 $ 2,900
Minimum future lease commitments under noncancelable lease agreements      
Fiscal 2020 4,100    
Fiscal 2021 3,931    
Fiscal 2022 3,622    
Fiscal 2023 4,127    
Fiscal 2024 4,324    
Thereafter 26,423    
Total future lease commitments 46,527    
Non-related Party [Member]      
Minimum future lease commitments under noncancelable lease agreements      
Fiscal 2020 1,236    
Fiscal 2021 1,068    
Fiscal 2022 759    
Fiscal 2023 530    
Fiscal 2024 361    
Thereafter 1,359    
Total future lease commitments 5,313    
Related Party [Member]      
Minimum future lease commitments under noncancelable lease agreements      
Fiscal 2020 2,864    
Fiscal 2021 2,863    
Fiscal 2022 2,863    
Fiscal 2023 3,597    
Fiscal 2024 3,963    
Thereafter 25,064    
Total future lease commitments $ 41,214