Product sales revenue - Schedule of product sales revenue (Details) - USD ($)	3 Months Ended	9 Months Ended
Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Product sales revenue [Abstract]
Product sales revenue recognized in the period1	$ 4,992,231	$ 1,232,423	$ 11,183,309	$ 2,153,422
Fair value pricing adjustments	(7,331,180)	361,140	(1,608,689)	529,109
Product sales revenue	(2,338,949)	1,593,563	9,574,620	2,682,531
Recycling services	372,510	115,560	950,134	301,216
Revenue	$ (1,966,439)	$ 1,709,123	$ 10,524,754	$ 2,983,747

The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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