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Inventories and major vendors - Additional Information (Detail)
 9 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Schedule of Inventory [Line Items]    
Number of major vendors 3 2
Vendor One
    
Schedule of Inventory [Line Items]    
Purchases of connector products, percentage 33.00% 17.00%
Vendor Two
    
Schedule of Inventory [Line Items]    
Purchases of connector products, percentage 14.00% 13.00%
Vendor Three
    
Schedule of Inventory [Line Items]    
Purchases of connector products, percentage 10.00%