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Fair value measurements (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Apr. 10, 2013	Oct. 31, 2012
Fair value measurements (Additional Textual) [Abstract]
Total revalue adjustment of contingent considerations	$ 0.2	$ 0.1	$ 1.4	$ 0.1
Limoneira [Member]
Fair value measurements (Textual) [Abstract]
Percentage of outstanding shares of Limoneira's shares owned	15.00%		15.00%
Limoneira's stock price	$ 18.63		$ 18.63		$ 29.02	$ 22.47
Unrealized investment holding losses	$ 5.4	$ 2.0	$ 6.6	$ 0.9

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This element represents the amount of any change, including any differences arising upon settlement, recognized during the reporting period in the value of a liability, arising from an item of contingent consideration, assumed in a business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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Price of a single share of a number of saleable stocks of a company.

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