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Fair value measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Apr. 30, 2013
Assets at Fair Value:
Total assets at fair value	$ 32,203
Liabilities at fair value:
Total liabilities at fair value	4,706
Limoneira [Member]
Assets at Fair Value:
Investment in Limoneira Company	32,203
Salsa Lisa contingent consideration [Member]
Liabilities at fair value:
Total liabilities at fair value	881
RFG contingent consideration [Member]
Liabilities at fair value:
Total liabilities at fair value	3,825
Level 1 [Member]
Assets at Fair Value:
Total assets at fair value	32,203
Liabilities at fair value:
Total liabilities at fair value
Level 1 [Member] \| Limoneira [Member]
Assets at Fair Value:
Investment in Limoneira Company	32,203
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	4,706
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	881
Level 3 [Member] \| RFG contingent consideration [Member]
Liabilities at fair value:
Total liabilities at fair value	$ 3,825

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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