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Related party transactions - FreshRealm (Details) - FreshRealm $ in Millions	3 Months Ended			12 Months Ended	15 Months Ended
	Jan. 31, 2021 USD ($)	Jul. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 31, 2020 USD ($)	Jan. 31, 2021 director item	Feb. 03, 2021 USD ($)
Related party
VIE ownership (as a percent)	37.00%			37.00%
Notes receivable from FreshRealm				$ 34.5		$ 34.5
Impair investment in FreshRealm		$ 2.8
Loss on reserve				$ 34.5
Number of officers | item					1
Number of board of directors | director					5
Revenue from related parties	$ 0.3		$ 0.2
RFG
Related party
Revenue from related parties			$ 0.2

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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