Related-Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Related Party Transaction [Line Items]
Percentage of entity's voting stock owned by related party	10.00%
Cadence Design Systems, Inc. [Member]
Related Party Transaction [Line Items]
Payment for license fees	$ 3.6	$ 3.6	$ 3.6
License amortization expenses included in research and development expense	$ 4.2	$ 3.4	$ 3.2