Cash dividends (Details) - USD ($)	3 Months Ended
	Jan. 02, 2016	Sep. 30, 2015	Oct. 15, 2014
Preference share dividends [Abstract]
Preferred stock, outstanding (in shares)	452,124	452,124
Series A Convertible Preferred Stock, stated value (in dollars per share)	$ 0.10	$ 0.10
Series A Convertible Preferred Stock [Member]
Preference share dividends [Abstract]
Preferred stock, issued (in shares)	452,124
Preferred stock, outstanding (in shares)	452,124
Series A Convertible Preferred Stock, stated value (in dollars per share)	$ 24
Percentage of cumulative annual dividend, Series A Convertible Preferred Stock	4.00%
Semi annual dividend			$ 217,000
Dividend payable	Apr. 15, 2015
Next semi-annual dividend payable	Oct. 15, 2015