Related Parties - Narrative (Details) $ in Thousands	6 Months Ended
	Mar. 13, 2019 USD ($) entity $ / ft²	Mar. 14, 2018 USD ($)	Mar. 12, 2014 option $ / ft²	Nov. 22, 2006 option
Related Party Transaction [Line Items]
Related party, ownership of common stock (greater than)	0.05
New Lease Agreement
Related Party Transaction [Line Items]
Ownership interest	50.00%
Percent of space rented	7.00%
Lessee leasing arrangements, term of contract			6 years
Number of options to extend lease years | option			2
Lessee leasing arrangements, renewal term			5 years
Lease annual rent payments per square foot (in dollars per square foot) | $ / ft²			27.56
Lease Agreement Executed in 2006
Related Party Transaction [Line Items]
Lessee leasing arrangements, term of contract				12 years
Number of options to extend lease years | option				2
Lessee leasing arrangements, renewal term				5 years
Lease annual rent payments per square foot (in dollars per square foot) | $ / ft²	22
Pappas Entities
Related Party Transaction [Line Items]
Number of related party entities | entity	2
Affiliated costs incurred as a percentage of relative total Company costs	0.54%	0.42%
Rent expense | $	$ 314	$ 285
Pappas Entities | Amended And Restated Master Sales Agreement
Related Party Transaction [Line Items]
Related party transaction, amount of transaction | $	$ 13	$ 2