Leases Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	4 Months Ended
	Nov. 18, 2020	Dec. 18, 2019
Leases [Abstract]
Operating lease expense	$ 1,120	$ 2,597
Variable lease expense	138	296
Short-term lease expense	92	63
Sublease expense	18	221
Total lease expense	$ 1,368	$ 3,177