Fair Value - Summary of Carrying Value and Estimated Fair Value of Outstanding Debt, Excluding Credit Facility (Detail) - USD ($) $ in Millions		Aug. 31, 2025	May 31, 2025
Fair Value Disclosures [Abstract]
Carrying Value		$ 73.4	$ 2.3
Fair Value, estimated	[1]	$ 73.8	$ 2.8

[1] The estimated fair value of long-term debt, including current maturities, was calculated based upon models utilizing market observable (Level 2) inputs and credit risk. For long-term variable rate debt, the carrying amount approximates fair value as the variable rates reset frequently at market rates. For the current maturities of long-term debt for fixed rate debt, the carrying amount approximates fair value due to its short-term nature.