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Organization and Significant Accounting Policies - Revenue by Category (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 135,223 | $ 61,891 | $ 83,271 | $ 86,911 | $ 87,930 | $ 75,322 | $ 72,979 | $ 78,043 | $ 367,296 | $ 314,274 | $ 268,424
Contract Liability |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,670 | 1,587 | 977
Domestic |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 201,046 | 151,124 | 142,158
International |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 166,250 | 163,150 | 126,266
U.S. government |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 225,341 | 182,586 | 156,996
Non-U.S. government |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 141,955 | 131,688 | 111,428
FFP |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 269,917 | 224,090 | 212,976
CPFF |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 94,176 | 89,485 | 55,203
T&M |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,203 | 699 | 245
Small UAS |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 225,888 | 183,157 | 167,534
TMS |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 63,781 | 65,087 | 63,406
HAPS |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 60,864 | 55,407 | 29,593
Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 16,763 | $ 10,623 | $ 7,891

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