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Organization and Significant Accounting Policies - Revenue by Category (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 26, 2019 USD ($) | Oct. 27, 2018 USD ($) contract | Oct. 26, 2019 USD ($) | Oct. 27, 2018 USD ($) contract
Disaggregation of revenue |  |  |  |
Number of active contracts | contract |  | 1 |  | 1
Contract Liability |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | $ 828,000 | $ 6,000 | $ 1,658,000 | $ 1,554,000
Domestic |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | 49,965,000 | 46,726,000 | 88,773,000 | 82,078,000
International |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | 33,306,000 | 26,253,000 | 81,409,000 | 68,944,000
U.S. government |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | 50,302,000 | 46,941,000 | 99,436,000 | 82,849,000
Non-U.S. government |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | 32,969,000 | 26,038,000 | 70,746,000 | 68,173,000
FFP |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | 60,518,000 | 50,054,000 | 128,462,000 | 108,057,000
CPFF |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | 21,257,000 | 22,870,000 | 39,521,000 | 42,853,000
T&M |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | 1,496,000 | 55,000 | 2,199,000 | 112,000
Small UAS |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | 59,157,000 | 42,199,000 | 125,903,000 | 83,415,000
TMS |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | 7,924,000 | 15,019,000 | 13,511,000 | 37,785,000
HAPS |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | 13,393,000 | 12,832,000 | 25,728,000 | 24,395,000
Other |  |  |  |
Disaggregation of revenue |  |  |  |
Revenue | $ 2,797,000 | $ 2,929,000 | $ 5,040,000 | $ 5,427,000

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