Revenue Recognition - Revenue by Product Class and Timing (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023
Disaggregation Of Revenue [Line Items]
Net sales	$ 805.8	$ 780.7	$ 2,519.6	$ 2,723.7
Direct
Disaggregation Of Revenue [Line Items]
Net sales	763.3	745.5	2,402.6	2,616.0
Toll
Disaggregation Of Revenue [Line Items]
Net sales	42.5	35.2	117.0	107.7
Toll | Over time revenue
Disaggregation Of Revenue [Line Items]
Net sales	$ 42.5	$ 35.2	$ 117.0	$ 107.7