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Revenue and Performance Obligations - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 574.0
Subscription | Minimum
Disaggregation of Revenue [Line Items]
Contract term	1 year
Subscription | Maximum
Disaggregation of Revenue [Line Items]
Contract term	3 years
Product concentration risk | Revenue | Subscription
Disaggregation of Revenue [Line Items]
Concentration risk percentage	94.00%	95.00%

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Contract With Customer, Term

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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-Publisher FASB
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