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Related party transactions - FreshRealm (Details) $ in Thousands				1 Months Ended					3 Months Ended							6 Months Ended		12 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	Dec. 31, 2017 USD ($)	Oct. 31, 2017 USD ($)	Apr. 30, 2020 USD ($)	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Apr. 30, 2018 USD ($) director	Apr. 30, 2020 USD ($) director item	Apr. 30, 2019 USD ($)	Oct. 31, 2019 USD ($)	Mar. 31, 2020	Nov. 25, 2019 USD ($)
Related party
Investments in unconsolidated entities				$ 9,755	$ 10,722				$ 9,755	$ 10,722						$ 9,755		$ 10,722
Additional loan																	$ 14,700
Notes receivable from FreshRealm				33,970	35,241				33,970	35,241						33,970		35,241
Notes receivable from FreshRealm converted to investment in FreshRealm																2,761
Payment to acquire unconsolidated entities																1,477
FreshRealm [Member]
Related party
Investments in unconsolidated entities				4,600	5,800				4,600	5,800						$ 4,600		$ 5,800
VIE ownership (as a percent)	37.00%	37.00%														37.00%		37.00%
Notes receivable from FreshRealm				34,000	35,200				34,000	35,200						$ 34,000		$ 35,200
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
Interest receivable				3,900	2,400				3,900	2,400						$ 3,900		2,400
Number of officers | item																3
Number of board of directors | director																5
Loans to FreshRealm members				200	200				200	200						$ 200		$ 200
Revenue from related parties									100			$ 100				300	200
FreshRealm [Member] | Former Chairman and Chief Executive Officer
Related party
Payment to acquire unconsolidated entities				400	500		$ 1,500	$ 7,000
FreshRealm [Member] | 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 [Member] | RFG
Related party
Revenue from related parties									$ 100			300				$ 300	$ 1,900
FreshRealm [Member] | NMUPA
Related party
Loan receivable commitment			$ 12,000
Additional loan													$ 3,000	$ 9,000
FreshRealm [Member] | $7.5 million Note
Related party
Additional loan													$ 7,500
FreshRealm [Member] | Unsecured Notes Receivable
Related party
Additional loan										$ 3,700	$ 5,400	$ 4,200

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