Revenue and contract costs - Schedule of Rollforward of Contract Assets and Contract Liabilities (Details) $ in Thousands	9 Months Ended
	Oct. 31, 2024 USD ($)
Contract with Customer Asset [Roll Forward]
Beginning balance	$ 3,375
Amount transferred to receivables from beginning balance of contract assets	(3,375)
Contract asset additions, net of reclassification to receivables	6,252
Ending balance	6,252
Contract with Customer Liability [Roll Forward]
Beginning balance	24,210
Revenue recognized that was included in deferred revenue at the beginning of the period	(22,644)
Other current period activity in deferred revenue	20,821
Ending balance	$ 22,387