Leases - Additional Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 28, 2021	Aug. 29, 2020
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 2,589	$ 2,463
Operating cash flows from financing leases	327	289
Financing cash flows from financing leases	572	362
Lease assets obtained in exchange for new lease liabilities:
Operating leases	2,626	1,179
Finance leases	$ 1,210	$ 5,664
Weighted average remaining lease term:
Operating leases	8 years 1 month 6 days	8 years 8 months 12 days
Finance leases	6 years 9 months 18 days	7 years 9 months 18 days
Weighted average discount rate:
Operating leases	6.20%	6.20%
Finance leases	6.30%	6.20%
Unfavorable lease liability	$ 965	$ 965