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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 29, 2020
Feb. 29, 2020
Feb. 23, 2019
Aug. 31, 2019
Components of lease expense        
Lease cost $ 1,441 $ 2,247    
Variable lease cost (1) 426 736    
Operating lease cost 1,867 2,983    
Short term lease cost 18 24    
Amortization of right-of use assets 66 136    
Interest on lease liabilities 16 32    
Total finance lease cost 82 168    
Total lease cost 1,967 3,175    
Assets and liabilities, lessee        
Operating lease, right-of-use asset 27,072 27,072    
Finance lease, right-of-use asset 1,049 1,049    
Total lease assets 28,121 28,121    
Operating lease, liability, current 3,947 3,947    
Finance lease, liability, current 264 264   $ 0
Operating lease, liability, noncurrent 23,842 23,842    
Finance lease, liability, noncurrent 786 786    
Total lease liabilities 28,839 28,839    
Future maturities of lease liabilities, operating leases        
Remainder of 2020 2,772 2,772    
2021 5,028 5,028    
2022 4,643 4,643    
2023 3,995 3,995    
2024 3,882 3,882    
Thereafter 14,706 14,706    
Total lease payments 35,026 35,026    
Less: Interest (7,237) (7,237)    
Present value of lease liabilities 27,789 27,789    
Future maturities of lease liabilities, finance leases        
Remainder of 2020 157 157    
2021 313 313    
2022 313 313    
2023 278 278    
2024 145 145    
Thereafter 0 0    
Total lease payments 1,206 1,206    
Less: Interest (156) (156)    
Present value of lease liabilities $ 1,050 $ 1,050   $ 0
Finance Lease, Weighted Average Discount Rate, Percent 5.60% 5.60%    
Finance Lease, Weighted Average Remaining Lease Term 3 years 10 months 24 days 3 years 10 months 24 days    
Operating Lease, Weighted Average Discount Rate, Percent 5.90% 5.90%    
Operating Lease, Weighted Average Remaining Lease Term 7 years 6 months 29 days 7 years 6 months 29 days    
Supplemental and other information related to leases        
Operating cash flows from operating leases   $ 2,817    
Operating cash flows from finance leases   9    
Financing cash flows from finance leases   157 $ 0  
Lease not yet commenced, expected payments $ 1,500 $ 1,500    
Lease not yet commenced, term of contract 7 years 3 months 18 days 7 years 3 months 18 days