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Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Jan. 31, 2022 USD ($)	Jan. 31, 2022 USD ($) segment	Jan. 31, 2022 USD ($)	Jan. 31, 2022 USD ($) operatingSegment	Jan. 31, 2021 USD ($)	Jan. 31, 2020 USD ($)
Concentration Risk [Line Items]
Number of operating segments		1		1
Amortization period of capitalized contract costs (in years)	3 years	3 years	3 years	3 years
Costs capitalized to obtain revenue contracts, gross	$ 47,800,000	$ 47,800,000	$ 47,800,000	$ 47,800,000	$ 33,200,000
Costs capitalized to obtain revenue contracts, amortization			39,500,000		34,600,000
Costs capitalized to obtain revenue contracts	61,300,000	61,300,000	61,300,000	61,300,000	53,000,000
Capitalized cost impairment			0		0	$ 0
Advertising expenses			8,400,000		7,500,000	6,900,000
Capitalized software development costs	$ 7,200,000	$ 7,200,000	7,200,000	$ 7,200,000	7,200,000
Capitalized computer software, amortization			3,700,000		2,600,000	$ 2,700,000
Capitalized computer software, additions			2,400,000		2,500,000
Amortization expense associated with cloud computing arrangements			$ 2,100,000		$ 800,000
Software Development | Minimum
Concentration Risk [Line Items]
Useful life (in years)	2 years
Software Development | Maximum
Concentration Risk [Line Items]
Useful life (in years)	3 years
Restricted Stock Units (RSUs) | Minimum
Concentration Risk [Line Items]
Award requisite service period (in years)	1 year
Restricted Stock Units (RSUs) | Maximum
Concentration Risk [Line Items]
Award requisite service period (in years)	4 years
Employee Stock Option
Concentration Risk [Line Items]
Award requisite service period (in years)	4 years
Furniture and fixtures
Concentration Risk [Line Items]
Property and equipment, useful life (in years)	5 years
Office equipment
Concentration Risk [Line Items]
Property and equipment, useful life (in years)	3 years
Computer software | Minimum
Concentration Risk [Line Items]
Property and equipment, useful life (in years)	2 years
Computer software | Maximum
Concentration Risk [Line Items]
Property and equipment, useful life (in years)	3 years

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