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Capital Stock and Stock-Based Awards (Tables)

12 Months Ended

May 31, 2025

Share-Based Payment Arrangement [Abstract]

Schedule of capital stock

Capital stock consisted of the following as of May 31, 2025:

			Class A Stock						Common Stock						Preferred Stock
Authorized			3,171,900						70,000,000						2,000,000
Reserved for Issuance			—						5,139,487						—
Outstanding			828,100						24,214,908						—

Schedule of share-based compensation activity

The following table sets forth the intrinsic value of stock options exercised, pretax stock-based compensation cost and related tax benefits for the Company's equity plans for the fiscal years ended May 31:

			2025									2024									2023
Total intrinsic value of stock options exercised			$			0.5						$			6.4						$			8.2
Total stock-based compensation cost (pretax)						9.3									11.0									10.5
Tax benefits (shortfalls) related to stock-based compensation cost						(2.5)									5.0									(7.8)
Weighted average grant date fair value per option			$			11.92						$			11.53						$			11.62

Schedule of stock option activity

The following table sets forth the stock option activity under the Company's equity plans for the fiscal year ended May 31, 2025:

			Options									Weighted Average Exercise Price									Average Remaining Contractual Term (in years)									Aggregate Intrinsic Value (in millions)
Outstanding at May 31, 2024						2,942,293						$			30.99
Granted						16,773									36.40
Exercised						(64,050)									21.21
Expired, canceled and forfeited						(231,218)									35.16
Outstanding at May 31, 2025						2,663,798						$			30.90									3.1						$			—
Exercisable at May 31, 2025						2,398,086						$			30.05									2.8						$			—

Schedule of restricted stock unit activity

The following table sets forth the restricted stock unit award activity for the fiscal years ended May 31:

						2025									2024									2023
Granted						410,392									177,867									139,111
Weighted average grant date price per unit			$			31.04						$			37.81						$			41.99

The following table sets forth the MSPP RSUs activity for the fiscal years ended May 31:

						2025									2024									2023
MSPP RSUs allocated						7,250									15,149									37,865
Purchase price per unit			$			21.49						$			27.86						$			25.51

Schedule of nonvested restricted stock unit activity

The following table sets forth the restricted stock unit and MSPP RSUs activity for the year ended May 31, 2025:

			Restricted stock units and MSPP RSUs												Weighted Average grant date fair value
Nonvested as of May 31, 2024			371,091									$			34.55
Granted			417,642												20.62
Vested			(177,324)												36.48
Forfeited			(22,183)												35.70
Nonvested as of May 31, 2025			589,226									$			31.14

Schedule of employee stock purchase plan activity

The following table sets forth the ESPP share activity for the fiscal years ended May 31:

						2025									2024									2023
Shares issued						109,015									79,458									80,897
Weighted average purchase price per share			$			21.84						$			32.38						$			29.07

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