Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 9,121	$ 204	$ 1,579	$ (494)	$ 755	$ 794	$ (603)	$ (865)	$ 10,410	$ 81
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									104	1
Net Income (Loss) Available to Common Stockholders, Basic									$ 10,306	$ 80
Weighted Average Number of Shares Outstanding, Basic									10,228,596	10,181,868
Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends									91,607	0
Net earnings/loss (in dollars per share)	$ 0	$ 0.02	$ 0.15	$ (0.05)	$ 0.07	$ 0.08	$ (0.06)	$ (0.09)	$ 0	$ 0
Net Income (Loss) Attributable to Parent, Diluted									$ 10,410	$ 81
Diluted shares									10,320,203	10,181,868
Diluted Earnings/ (Loss) Per Share (in dollars per share)									$ 0	$ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									32,788	855,836