Nature of Business and Basis of Presentation (Details)	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
POSCO Energy [Member]
Common stock ownership percentage	10.00%		10.00%
significant customer revenue percentage	75.00%	53.00%	65.00%	68.00%
NRG Energy [Member]
Common stock ownership percentage	6.00%		6.00%
significant customer revenue percentage	0.00%	0.00%	2.00%