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Organization and Significant Accounting Policies - Revenue by Category (Details) - USD ($)	3 Months Ended
	Aug. 01, 2020	Jul. 27, 2019
Contract Liability
Disaggregation of revenue
Revenue	$ 1,973,000	$ 830,000
Domestic
Disaggregation of revenue
Revenue	53,430,000	38,808,000
International
Disaggregation of revenue
Revenue	34,020,000	48,103,000
U.S. government
Disaggregation of revenue
Revenue	53,796,000	49,134,000
Non-U.S. government
Disaggregation of revenue
Revenue	33,654,000	37,777,000
FFP
Disaggregation of revenue
Revenue	60,875,000	67,944,000
CPFF
Disaggregation of revenue
Revenue	26,569,000	18,264,000
T&M
Disaggregation of revenue
Revenue	6,000	703,000
Small UAS
Disaggregation of revenue
Revenue	56,202,000	66,745,000
TMS
Disaggregation of revenue
Revenue	9,534,000	5,587,000
HAPS
Disaggregation of revenue
Revenue	16,386,000	12,335,000
Other
Disaggregation of revenue
Revenue	$ 5,328,000	$ 2,244,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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