Earnings Per Share Earnings Per Share - Summary of Shares Used in EPS Calculation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Basic net income (loss) per share:
Net income (loss)	$ 806,000	$ 1,605,000	$ (674,000)	$ 4,610,000
Less: Income attributable to non-vested shares	(10,000)	(18,000)	0	(52,000)
Net income (loss) available to common stockholders	$ 796,000	$ 1,587,000	$ (674,000)	$ 4,558,000
Basic (in shares)	10,193,200	10,211,347	10,176,626	10,210,805
Basic net income (loss) per share (in usd per share)	$ 80	$ 160	$ (70)	$ 450
Diluted net income (loss) per share:
Net income (loss)	$ 806,000	$ 1,605,000	$ (674,000)	$ 4,610,000
Shares used in computing basic net income (loss) per share(in shares)	10,193,200	10,211,347	10,176,626	10,210,805
Dilutive effect of non-vested shares	$ 0	$ 0	$ 0	$ 0
Shares used in computing diluted net income (loss) per share	10,193,200	10,211,347	10,176,626	10,210,805
Diluted net income (loss) per share (in usd per share)	$ 80	$ 160	$ (70)	$ 450
Anti-dilutive shares excluded (in shares)	1,147,086	940,354	1,147,086	940,354