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Fair value measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Assets at Fair Value:  
Total assets at fair value $ 38,789
Liabilities at fair value:  
Total liabilities at fair value 893
Limoneira [Member]
  
Assets at Fair Value:  
Investment in Limoneira Company 38,789
Salsa Lisa contingent consideration [Member]
  
Liabilities at fair value:  
Total liabilities at fair value 893
RFG contingent consideration [Member]
  
Liabilities at fair value:  
Total liabilities at fair value   
Level 1 [Member]
  
Assets at Fair Value:  
Total assets at fair value 38,789
Liabilities at fair value:  
Total liabilities at fair value   
Level 1 [Member] | Limoneira [Member]
  
Assets at Fair Value:  
Investment in Limoneira Company 38,789
Level 1 [Member] | Salsa Lisa contingent consideration [Member]
  
Liabilities at fair value:  
Total liabilities at fair value   
Level 1 [Member] | RFG contingent consideration [Member]
  
Liabilities at fair value:  
Total liabilities at fair value   
Level 2 [Member]
  
Assets at Fair Value:  
Total assets at fair value   
Liabilities at fair value:  
Total liabilities at fair value   
Level 2 [Member] | Limoneira [Member]
  
Assets at Fair Value:  
Investment in Limoneira Company   
Level 2 [Member] | Salsa Lisa contingent consideration [Member]
  
Liabilities at fair value:  
Total liabilities at fair value   
Level 2 [Member] | RFG contingent consideration [Member]
  
Liabilities at fair value:  
Total liabilities at fair value   
Level 3 [Member]
  
Assets at Fair Value:  
Total assets at fair value   
Liabilities at fair value:  
Total liabilities at fair value 893
Level 3 [Member] | Limoneira [Member]
  
Assets at Fair Value:  
Investment in Limoneira Company   
Level 3 [Member] | Salsa Lisa contingent consideration [Member]
  
Liabilities at fair value:  
Total liabilities at fair value 893
Level 3 [Member] | RFG contingent consideration [Member]
  
Liabilities at fair value:  
Total liabilities at fair value