Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Tax Examination [Line Items]
Unrecognized tax benefits which would affect effective income tax rate if recognized	$ 18.5
Income tax examination, penalties and interest expense	1.3	$ 6.2	$ (2.0)
Accrued income tax penalties and interest	2.9	$ 4.2
Foreign Tax Authority
Income Tax Examination [Line Items]
Operating loss carryforwards	$ 21.8