Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 26, 2019	Sep. 25, 2018
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 0	$ 0
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	12,522,778	12,481,162
Common stock, shares outstanding	12,522,778	12,481,162