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Organization and Significant Accounting Policies - Revenue by Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 30, 2021	Jan. 25, 2020	Jan. 30, 2021	Jan. 25, 2020
Contract Liability
Disaggregation of revenue
Revenue	$ 0	$ 12	$ 5,423	$ 1,670
Domestic
Disaggregation of revenue
Revenue	51,062	27,626	150,890	116,399
International
Disaggregation of revenue
Revenue	27,720	34,265	108,007	115,674
U.S. government
Disaggregation of revenue
Revenue	60,633	25,535	170,023	124,971
Non-U.S. government
Disaggregation of revenue
Revenue	18,149	36,356	88,874	107,102
FFP
Disaggregation of revenue
Revenue	61,230	40,145	190,530	168,607
CPFF
Disaggregation of revenue
Revenue	17,530	20,863	68,329	60,384
T&M
Disaggregation of revenue
Revenue	22	883	38	3,082
Small UAS
Disaggregation of revenue
Revenue	50,536	36,965	165,003	162,868
TMS
Disaggregation of revenue
Revenue	19,598	7,908	48,093	21,419
HAPS
Disaggregation of revenue
Revenue	7,480	11,762	35,318	37,490
Other
Disaggregation of revenue
Revenue	$ 1,168	$ 5,256	$ 10,483	$ 10,296

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