XML 42 R31.htm IDEA: XBRL DOCUMENT v3.19.2
Business Acquisition - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Mar. 15, 2019
Apr. 30, 2019
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Business Acquisitions [Line Items]            
Revenues   $ 13,626,000   $ 20,515,000 $ 24,273,000 $ 28,482,000
C Enterprises Inc [Member]            
Business Acquisitions [Line Items]            
Payments to Acquire Businesses, Net of Cash Acquired $ 600,000          
Revenues     $ 1,700,000   $ 1,700,000  
C Enterprises Inc [Member] | Selling And General Expenses [Member]            
Business Acquisitions [Line Items]            
Business Combination, Acquisition Related Costs $ 100,000