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Summary of significant accounting policies (Details)	3 Months Ended
Summary of significant accounting policies (Details)	Apr. 30, 2024 processor
Concentration Risk [Line Items]
Number of third-party payment processors	1
Minimum
Concentration Risk [Line Items]
Customer payment period	30 days
Settlement period (in days)	1 day
Maximum
Concentration Risk [Line Items]
Customer payment period	60 days
Settlement period (in days)	2 days