Leases (Supplemental Balance Sheet Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 28, 2021	Aug. 29, 2020
Leases [Abstract]
Operating lease assets	$ 49,011	$ 56,173
Finance lease assets	2,377	3,625
Total leased assets	51,388	59,798
Current operating lease liabilities	13,927	21,815
Current finance lease liabilities	1,273	1,262
Noncurrent operating lease liabilities	36,429	34,379
Noncurrent finance lease liabilities	1,188	2,453
Total lease liabilities	$ 52,817	$ 59,909
Weighted average remaining lease term (years), Operating leases	5 years	4 years
Weighted average remaining lease term (years), Finance leases	2 years	2 years 10 months 24 days
Weighted average discount rate, Operating leases	3.60%	3.60%
Weighted average discount rate, Finance leases	2.70%	2.70%
Finance lease right of use assets, Accumulated amortization	$ 2,729	$ 1,439
Operating lease impairment loss net of gains related to settlement of lease liabilities	$ 14,975