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Nature of Business and Basis of Presentation (Details) (USD $)
|
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
|
Apr. 30, 2013
|
Apr. 30, 2012
|
Apr. 30, 2013
|
Apr. 30, 2012
|
Oct. 31, 2012
|
|
| Restricted cash and cash equivalents | $ 10,689,000 | $ 10,689,000 | $ 5,335,000 | ||
| Restricted cash and cash equivalents | 4,950,000 | 4,950,000 | 5,300,000 | ||
| significant customer revenue percentage | 90.00% | 91.00% | 91.00% | 78.00% | |
| Letters of Credit Outstanding, Amount | $ 13,100,000 | $ 13,100,000 | $ 9,600,000 | ||
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Dominion Bridgeport FuelCell Park [Member]
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| significant customer revenue percentage | 21.00% | 0.00% | 19.00% | 0.00% | |
|
POSCO Energy [Member]
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| Common stock ownership percentage | 16.00% | 16.00% | |||
| significant customer revenue percentage | 63.00% | 83.00% | 66.00% | 72.00% | |
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U.S. Government [Member]
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| significant customer revenue percentage | 6.00% | 8.00% | 6.00% | 6.00% | |