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Organization and Significant Accounting Policies - Revenue by Category (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2021	Jan. 30, 2021	Oct. 31, 2020	Aug. 01, 2020	Apr. 30, 2020	Jan. 25, 2020	Oct. 26, 2019	Jul. 27, 2019	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Disaggregation of revenue
Revenue	$ 136,015	$ 78,782	$ 92,665	$ 87,450	$ 135,223	$ 61,891	$ 83,271	$ 86,911	$ 394,912	$ 367,296	$ 314,274
Contract Liability
Disaggregation of revenue
Revenue									5,468	1,670	1,587
Domestic
Disaggregation of revenue
Revenue									241,898	201,046	151,124
International
Disaggregation of revenue
Revenue									153,014	166,250	163,150
U.S. government
Disaggregation of revenue
Revenue									271,273	225,341	182,586
Non-U.S. government
Disaggregation of revenue
Revenue									123,639	141,955	131,688
FFP
Disaggregation of revenue
Revenue									307,413	269,917	224,090
CPFF
Disaggregation of revenue
Revenue									86,719	94,176	89,485
T&M
Disaggregation of revenue
Revenue									780	3,203	699
Small UAS
Disaggregation of revenue
Revenue									235,854	225,888	183,157
MUAS
Disaggregation of revenue
Revenue									15,837
TMS
Disaggregation of revenue
Revenue									87,268	63,781	65,087
HAPS
Disaggregation of revenue
Revenue									42,426	60,864	55,407
Other
Disaggregation of revenue
Revenue									$ 13,527	$ 16,763	$ 10,623

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