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Organization and Significant Accounting Policies - Revenue by Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 26, 2019	Oct. 31, 2020	Oct. 26, 2019
Contract Liability
Disaggregation of revenue
Revenue	$ 3,451	$ 828	$ 5,423	$ 1,658
Domestic
Disaggregation of revenue
Revenue	46,398	49,965	99,828	88,773
International
Disaggregation of revenue
Revenue	46,267	33,306	80,287	81,409
U.S. government
Disaggregation of revenue
Revenue	55,594	50,302	109,390	99,436
Non-U.S. government
Disaggregation of revenue
Revenue	37,071	32,969	70,725	70,746
FFP
Disaggregation of revenue
Revenue	68,425	60,518	129,300	128,462
CPFF
Disaggregation of revenue
Revenue	24,230	21,257	50,799	39,521
T&M
Disaggregation of revenue
Revenue	10	1,496	16	2,199
Small UAS
Disaggregation of revenue
Revenue	58,265	59,157	114,467	125,903
TMS
Disaggregation of revenue
Revenue	18,961	7,924	28,495	13,511
HAPS
Disaggregation of revenue
Revenue	11,452	13,393	27,838	25,728
Other
Disaggregation of revenue
Revenue	$ 3,987	$ 2,797	$ 9,315	$ 5,040

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