Organization and Significant Accounting Policies - Revenue by Category (Details) - USD ($)	12 Months Ended
	Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2024
Disaggregation of revenue
Revenue	$ 1,976,845,000	$ 820,627,000	$ 716,720,000
Contract Liability
Disaggregation of revenue
Revenue	12,331,000	9,980,000	13,757,000
Domestic
Disaggregation of revenue
Revenue	1,420,437,000	390,744,000	271,727,000
International
Disaggregation of revenue
Revenue	556,408,000	429,883,000	444,993,000
U.S. government
Disaggregation of revenue
Revenue	1,688,719,000	613,053,000	544,885,000
Non-U.S. government
Disaggregation of revenue
Revenue	288,126,000	207,574,000	171,835,000
Prepaid expenses and other current assets
Disaggregation of revenue
Capitalized costs	0	1,948,000
FFP
Disaggregation of revenue
Revenue	1,384,333,000	746,190,000	634,266,000
Cost Plus
Disaggregation of revenue
Revenue	454,113,000	67,986,000	77,458,000
T&M
Disaggregation of revenue
Revenue	138,399,000	6,451,000	4,996,000
Uncrewed Aircraft Systems
Disaggregation of revenue
Revenue	363,878,000	352,019,000	407,671,000
Precision Strike and Defense Systems
Disaggregation of revenue
Revenue	848,342,000	359,433,000	192,587,000
Other
Disaggregation of revenue
Revenue	145,857,000	$ 109,175,000	$ 116,462,000
Space and Directed Energy
Disaggregation of revenue
Revenue	273,404,000
Cyber and Mission Solutions
Disaggregation of revenue
Revenue	$ 345,364,000