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Business Segment Information - Customers Percentage of Sales (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2025	May 31, 2024	May 31, 2023
Business Segment Information
Net sales	$ 2,780.5	$ 2,318.9	$ 1,990.5
U.S. Department of Defense, other U.S. government agencies and their contractors
Business Segment Information
Net sales	687.6	576.1	577.0
Parts Supply
Business Segment Information
Net sales	1,099.6	967.0	818.4
Parts Supply | U.S. Department of Defense, other U.S. government agencies and their contractors
Business Segment Information
Net sales	143.3	99.3	111.0
Parts Supply | Commercial
Business Segment Information
Net sales	879.2	800.6	645.0
Parts Supply | Government and defense
Business Segment Information
Net sales	220.4	166.4	173.4
Repair & Engineering
Business Segment Information
Net sales	884.9	640.1	533.4
Repair & Engineering | U.S. Department of Defense, other U.S. government agencies and their contractors
Business Segment Information
Net sales	81.6	61.0	48.5
Repair & Engineering | Commercial
Business Segment Information
Net sales	795.4	574.1	478.5
Repair & Engineering | Government and defense
Business Segment Information
Net sales	89.5	66.0	54.9
Integrated Solutions
Business Segment Information
Net sales	695.3	641.9	546.9
Integrated Solutions | U.S. Department of Defense, other U.S. government agencies and their contractors
Business Segment Information
Net sales	372.1	356.6	340.2
Integrated Solutions | Commercial
Business Segment Information
Net sales	297.5	257.1	197.0
Integrated Solutions | Government and defense
Business Segment Information
Net sales	397.8	384.8	349.9
Expeditionary Services
Business Segment Information
Net sales	100.7	69.9	91.8
Expeditionary Services | U.S. Department of Defense, other U.S. government agencies and their contractors
Business Segment Information
Net sales	90.6	59.2	77.3
Expeditionary Services | Commercial
Business Segment Information
Net sales	4.0	6.1	8.3
Expeditionary Services | Government and defense
Business Segment Information
Net sales	$ 96.7	$ 63.8	$ 83.5
Customer | Total sales | U.S. Department of Defense, other U.S. government agencies and their contractors
Business Segment Information
Percentage of total sales	24.70%	24.80%	29.00%

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