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Related party transactions - FreshRealm (Details) $ in Thousands, $ in Millions				1 Months Ended			3 Months Ended								9 Months Ended
	Apr. 01, 2020 USD ($) director	Feb. 03, 2020 USD ($)	Jul. 31, 2018 USD ($)	Apr. 30, 2020 USD ($) director	Oct. 31, 2019 USD ($) director	Jan. 31, 2018 USD ($) director	Jul. 31, 2020 USD ($)	Jul. 31, 2020 MXN ($)	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Apr. 30, 2018 USD ($) director	Jul. 31, 2020 USD ($) item director	Jul. 31, 2019 USD ($)	Jul. 31, 2020 MXN ($)	Mar. 31, 2020	Nov. 25, 2019 USD ($)
Related party
Investments in unconsolidated entities					$ 10,722		$ 5,800		$ 10,722						$ 5,800
Additional loan																$ 20,100
Notes receivable from FreshRealm					35,241				35,241
Notes receivable from FreshRealm converted to investment in FreshRealm															2,761
Payment to acquire unconsolidated entities															1,477
FreshRealm
Related party
Investments in unconsolidated entities					5,800		0		5,800						$ 0
Impair investment in FreshRealm							2,800	$ 2.8
VIE ownership (as a percent)	37.00%	37.00%													37.00%
Notes receivable from FreshRealm					35,200		34,200		35,200						$ 34,200
Convertible note receivable																			$ 2,700
Loan receivable interest rate (as a percent)	3.00%																	10.00%	10.00%
Notes receivable from FreshRealm converted to investment in FreshRealm	$ 1,000	$ 2,700
Subscription agreements issued by investment	4,000
Payment to acquire unconsolidated entities	$ 500
Number of extension option | director	2
Extension period	1 year
Loan write-off							34,200	$ 34.2
Interest receivable					2,400		4,100		2,400						$ 4,100		$ 4.1
Number of officers | item															1
Number of board of directors | director															5
Revenue from related parties							100			$ 200					$ 400	400
FreshRealm | Former Chairman and Chief Executive Officer
Related party
Payment to acquire unconsolidated entities				$ 400	500
FreshRealm | Non Executive Directors
Related party
Payment to acquire unconsolidated entities				$ 100	$ 200	$ 1,800								$ 1,200
Number of officers | director				2
Number of board of directors | director					1	1								2
FreshRealm | RFG
Related party
Revenue from related parties							$ 100			100					$ 300	$ 2,000
FreshRealm | NMUPA
Related party
Loan receivable commitment			$ 12,000
Additional loan												$ 3,000	$ 9,000
FreshRealm | $7.5 million Note
Related party
Additional loan												$ 7,500
FreshRealm | Unsecured Notes Receivable
Related party
Additional loan									$ 3,700	$ 5,400	$ 4,200

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