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Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Schedule Of Accrued Liabilities [Line Items]    
Product warranty accrual, warranties issued $ 0.6 $ 0.3
Product warranty accrual, payment and adjustments 0.8 0.7
Loss reserve on service agreements 1.1 2.7
Increase in reserve for service agreement costs 1.6  
Reserve for performance guarantees 2.2 $ 3.3
POSCO Energy [Member]    
Schedule Of Accrued Liabilities [Line Items]    
Other customer contractual milestone liabilities for inventory 4.4  
Additional billed and collected contractual milestone liabilities for inventory $ 10.4