Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Jan. 31, 2020
Significant Accounting Policies [Line Items]
Subscriptions revenue contracts term			3 years
Accounts receivable, net of allowances	$ 101,120,000		$ 101,120,000		$ 118,508,000
Short-term unbilled receivable	4,600,000		4,600,000		6,100,000
Revenue expected to be recognized from remaining performance obligation	744,800,000		744,800,000
Revenue recognized from performance obligations satisfied in prior periods	3,300,000		4,900,000
Allowances for doubtful accounts and credit losses	3,300,000		3,300,000
Revenue recognized from deferred revenue	$ 102,300,000		$ 158,800,000
Deferred commission, amortization period	5 years		5 years
Capitalized commission costs	$ 4,100,000	$ 6,200,000	$ 6,100,000	$ 9,900,000
Amortization of deferred commissions	$ 3,300,000	$ 2,300,000	$ 6,500,000	$ 4,300,000
ASU 2016-13
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true		true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Feb. 01, 2020		Feb. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true		true
ASU 2019-12
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true		true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Feb. 01, 2020		Feb. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true		true
Maximum
Significant Accounting Policies [Line Items]
Payment terms of customers			30 days
Other Assets
Significant Accounting Policies [Line Items]
Long-term unbilled receivables	$ 267,000		$ 267,000		$ 350,000