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Share-Based Compensation	9 Months Ended
Share-Based Compensation	Feb. 28, 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 February 28, 2021, there was a maximum of 2.4 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 February 28, 2021, there was a maximum of 4.0 million shares of common stock available for future grant under the employee stock purchase plan. For the three months ended February 28, 2021 and February 29, 2020, share-based compensation expense was $2.1 million and $1.8 million, respectively. For the nine months ended February 28, 2021 and February 29, 2020, share-based compensation expense was $6.4 million and $6.0 million, respectively During the nine months ended February 28, 2021 and February 29, 2020, the Company granted stock options and restricted stock units under the 2004 Plan and 2020 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 nine months ended February 28, 2021 and February 29, 2020, the Company granted performance share units under the 2004 Plan to certain employees. The awards may be earned by achieving relative 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 are based on the closing trading value of the Company’s common stock on the date of grant and use a Monte Carlo simulation model. As of February 28, 2021, there was $14.4 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 four years. The Company has sufficient shares to satisfy expected share-based payment arrangements.