Nature of Business and Basis of Presentation (Details)	3 Months Ended		6 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
POSCO Energy [Member]
Common stock ownership percentage	8.00%		8.00%
significant customer revenue percentage	52.00%	66.00%	48.00%	59.00%
NRG Energy [Member]
Common stock ownership percentage	5.00%		5.00%
significant customer revenue percentage	0.40%	1.00%	0.20%	3.00%