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Related Party Transactions (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Mar. 11, 2014
Jul. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Related Party Transaction [Line Items]          
Related-party accounts receivable     $ 1,092 $ 533  
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax     (441) 100 $ 0
Machinery and Equipment, Gross     495,481 455,482  
Velocys [Member] | Investee [Member]          
Related Party Transaction [Line Items]          
Related-party revenue     1,372    
Related-party accounts receivable     9    
Payments to Acquire Marketable Securities Including Premium $ 2,000        
Marketable Securities 1,527        
Investment, Unamortized Premium $ 473        
Available-for-sale Securities, Gross Realized Gains   $ 365      
Payments to Acquire Machinery and Equipment     3,200    
MTD Holdings Inc. [Member] | Significant Shareholder [Member]          
Related Party Transaction [Line Items]          
Related-party revenue     $ 6,411 $ 6,756 $ 7,645