Nature of Business and Basis of Presentation (Details)	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
POSCO Energy [Member]
Common stock ownership percentage	10.00%		10.00%
significant customer revenue percentage	66.00%	78.00%	59.00%	75.00%
NRG Energy [Member]
Common stock ownership percentage	6.00%		6.00%
significant customer revenue percentage	1.00%	0.00%		3.00%