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Revenue and Deferred Revenue - Additional Information (Details) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2020	Jul. 31, 2020 USD ($)	Jul. 31, 2019	Jul. 31, 2020 USD ($) Source Country Customer	Jul. 31, 2019 Country Customer	Jan. 31, 2020
Disaggregation Of Revenue [Line Items]
Number of sources of revenue | Source				2
Number of countries outside United States represented 10% or more of total revenue | Country				0	0
Number of customers that individually exceeded 10% of revenue | Customer				0	0
Deferred revenue recognized | $		$ 3.0		$ 12.3
Accounts Receivable | Customer Concentration Risk
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	15.00%
Accounts Receivable | Customer Concentration Risk | Minimum
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage						10.00%
Ooma Residential | Revenue
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage		55.00%	59.00%	55.00%	62.00%
Ooma Business | Revenue
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage		43.00%	38.00%	43.00%	36.00%

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