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Revenue and Deferred Revenue - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 USD ($) Source Country Customer | Apr. 30, 2018 Country Customer | Jan. 31, 2019
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 | $ 8.4 |  |
Revenue expected to be recognized from remaining performance obligations | $ 0.3 |  |
Accounts Receivable | Customer Concentration Risk |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Concentration risk, percentage | 15.00% |  | 15.00%
Ooma Residential | Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Concentration risk, percentage | 64.00% | 71.00% |
Ooma Business | Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Concentration risk, percentage | 33.00% | 26.00% |

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