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Inventories and major vendors - Additional Information (Detail)
 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Schedule of Inventory [Line Items]    
Number of major vendors 3 2
Vendor One
    
Schedule of Inventory [Line Items]    
Purchases of connector products, percentage 35.00% 16.00%
Vendor Two
    
Schedule of Inventory [Line Items]    
Purchases of connector products, percentage 17.00% 10.00%
Vendor Three
    
Schedule of Inventory [Line Items]    
Purchases of connector products, percentage 10.00%