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Principal Commercial Commitments under Repurchase Agreements and Dealer Inventory Financing Guarantees (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Guarantee On Dealer Inventory Financing
    
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Total Amount Committed $ 375 $ 900
Term of Commitments Various  
Standby Repurchase Obligations On Dealer Inventory Financing
    
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Standby Repurchase Obligations Amount $ 1,027,567 $ 861,738
Term of Commitments Up to eighteen months