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Share-Based Compensation	6 Months Ended
Share-Based Compensation	Nov. 30, 2021
Share-based Payment Arrangement [Abstract]
Share-Based Compensation	SHARE-BASED COMPENSATION On October 13, 2020, the Company's shareholders approved the 2020 Stock and Incentive Award Plan (the “2020 Plan”). The 2020 Plan provides for the grant of incentive stock options, non-statutory stock options, restricted stock, restricted stock units, stock appreciation rights, performance share units, performance shares and other incentive awards to the Company's employees, directors and other service providers. As of November 30, 2021, there was a maximum of 1.5 million shares of common stock available for future grant under the 2020 Plan. Prior to the adoption of the 2020 Plan, equity awards were issued under the 2004 Stock and Incentive Award Plan (the “2004 Plan”). The adoption of the 2020 Plan did not impact the administration of equity awards issued under the 2004 Plan but following the adoption of the 2020 Plan, equity award grants are no longer made under the 2004 Plan. The Company also has an employee stock purchase plan. As of November 30, 2021, there was a maximum of 2.4 million shares of common stock available for future grant under the employee stock purchase plan. For the three months ended November 30, 2021 and 2020, share-based compensation expense was $3.0 million and $2.4 million, respectively. For the six months ended November 30, 2021 and 2020, share-based compensation expense was $5.4 million and $4.3 million, respectively. During the six months ended November 30, 2021 and 2020, the Company granted stock options and restricted stock units under the 2020 and 2004 Plan to certain employees and members of the Board of Directors. Stock option awards are valued using the Black-Scholes option-pricing model and then amortized on a straight-line basis over the requisite service period of the award. Restricted stock unit awards are valued based on the closing trading value of the Company’s common stock on the date of grant and then amortized on a straight-line basis over the requisite service period of the award. During the six months ended November 30, 2021 and 2020, the Company granted performance share units under the 2020 and 2004 Plan to certain employees. The awards may be earned by achieving performance levels over the requisite service period. The performance criteria are based on achieving certain performance targets and the total shareholder return (“TSR”) of the Company’s common stock relative to the TSR of the common stock of a pre-defined industry peer-group. The fair value of these awards is based on a Monte Carlo simulation model. As of November 30, 2021, there was $22.1 million of unrecognized compensation expense related to share-based payment arrangements. These costs are expected to be recognized over a weighted-average period of approximately three years. The Company has sufficient shares to satisfy expected share-based payment arrangements.