Income taxes - Schedule of Changes in Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 03, 2019	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of beginning of year		$ 18,600	$ 11,700	$ 9,600
Gross increases		600	0	0
Tax positions taken in current period gross decreases		0	(1,000)	0
Tax positions taken in current period gross increases		5,200	7,900	2,100
Balance as of end of year		$ 24,400	$ 18,600	$ 11,700
Hortonworks, Inc
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Tax positions taken in current period gross increases	$ 7,400