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Document and Entity Information (USD $)
 12 Months Ended
Oct. 31, 2012
Apr. 30, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name CURRENCYSHARES CANADIAN DOLLAR TRUST  
Entity Central Index Key 0001353612  
Document Type 10-K  
Document Period End Date Oct. 31, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus FY  
Current Fiscal Year End Date --10-31  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Public Float   $ 578,852,500
Entity Common Stock, Shares Outstanding   5,750,000