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Commitments and contingencies (Details) $ in Thousands			3 Months Ended	9 Months Ended
Commitments and contingencies (Details) $ in Thousands	Sep. 06, 2018 lawsuit	Jun. 22, 2018 lawsuit	Oct. 31, 2020 USD ($)	Oct. 31, 2020 USD ($)	Oct. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Principal payments on long-term debt				$ 223,438	$ 0
Number of derivative lawsuits \| lawsuit	2	2
Term Loan Facility \| Line of Credit
Loss Contingencies [Line Items]
Principal payments on long-term debt			$ 200,000	$ 200,000