Consolidated Statements of Comprehensive Income (Loss)(Parenthetical) - USD ($) $ in Millions	12 Months Ended
	May 31, 2026	May 31, 2025	May 31, 2024
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on marketable securities, net of tax			$ 0.3
Unrealized gain (loss) on derivative instruments, net of tax	$ 0.2	$ (1.0)	$ 1.2

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.