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Capital Stock and Stock-Based Awards (Tables)

12 Months Ended

May 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of capital stock

Capital stock consisted of the following as of May 31, 2021:

			Class A Stock						Common Stock						Preferred Stock
Authorized			4,000,000						70,000,000						2,000,000
Reserved for Issuance			—						8,128,785						—
Outstanding			1,656,200						32,707,795						—

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:

			2021									2020									2019
Total intrinsic value of stock options exercised			$			0.1						$			0.2						$			2.1
Total stock-based compensation cost (pretax)						6.6									3.8									8.3
Tax benefits (shortfalls) related to stock-based compensation cost						(3.7)									(0.5)									0.5
Weighted average grant date fair value per option			$			3.80						$			6.99						$			11.97

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, 2021:

			Options									Weighted Average Exercise Price									Average Remaining Contractual Term (in years)									Aggregate Intrinsic Value (in millions)
Outstanding at May 31, 2020						3,002,981						$			36.43
Granted						2,385,096									21.07
Exercised						(14,760)									27.40
Expired, canceled and forfeited						(386,055)									28.50
Outstanding at May 31, 2021						4,987,262						$			29.73									5.4						$			31.5
Exercisable at May 31, 2021						2,386,124						$			36.55									4.3						$			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:

						2021									2020									2019
Granted						137,106									34,632									82,044
Weighted average grant date price per unit			$			21.24						$			32.56						$			42.86

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

						2021									2020									2019
MSPP RSUs allocated						5,665									3,843									17,239
Purchase price per unit			$			16.88						$			24.36						$			30.48

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, 2021:

			Restricted stock units and MSPP RSUs												Weighted Average grant date fair value
Nonvested as of May 31, 2020			226,433									$			25.11
Granted			142,771												20.56
Vested			(140,061)												22.77
Forfeited			(12,045)												39.85
Nonvested as of May 31, 2021			217,098									$			22.80

Schedule of employee stock purchase plan activity

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

						2021									2020									2019
Shares issued						67,097									65,714									48,000
Weighted average purchase price per share			$			22.19						$			27.84						$			36.25

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