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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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