Calculation of earnings per share and weighted average shares outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Numerator [Abstract]
Net (loss) income attributable to common stockholders for computing net (loss) income per ordinary share - basic	$ (2,518)	$ 11
Denominator [Abstract]
Weighted average shares used in calculating net income (loss) per ordinary share - basic (in shares)	5,214,000	3,429,000
Adjustment for shares issuable upon vesting of restricted stock (in shares)	0	147,000
Weighted average shares used in calculating net (loss) income per ordinary share - diluted (in shares)	5,214,000	3,576,000
Net (loss) income per ordinary share - basic (in dollars per share)	$ (0.48)	$ 0
Net (loss) income per ordinary share - diluted (in dollars per share)	$ (0.48)	$ 0
Series A Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive shares excluded from calculation of earnings per share (in shares)	1,346,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive shares excluded from calculation of earnings per share (in shares)	81,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive shares excluded from calculation of earnings per share (in shares)	50,625