Capital Stock and Stock-Based Awards - Narrative (Details) - USD ($)					12 Months Ended			49 Months Ended
	Jul. 19, 2023	Jul. 21, 2021	Sep. 26, 2018	Sep. 24, 2014	May 31, 2024	May 31, 2023	May 31, 2022	Sep. 30, 2011	Sep. 21, 2021	Sep. 30, 2017	Sep. 21, 2011	Sep. 30, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock issued (in shares)					0	0
Options outstanding ( in shares)					2,942,293	3,188,401
Granted (in dollars per share)					$ 37.01
Granted (Shares)					272,252
Minimum period before grants exercisable					1 year
Stock option compensation cost not yet recognized					$ 2,000,000.0
Future period of stock option expense recognition (in years)					1 year 7 months 6 days
Directors Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding ( in shares)					160,124
Common stock remaining authorized (in shares)					132,174
Shares reserved for issuance (in shares)										400,000
Restricted stock outstanding (in shares)					26,174
Plan 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of shares available for grant (in shares)									2,500,000
Options outstanding ( in shares)					831,324
Granted (in dollars per share)					$ 37.01
Common stock remaining authorized (in shares)					1,268,955
Granted (Shares)					272,252
Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of shares available for grant (in shares)			7,115,000								2,100,000
Increase in shares available for grant (in shares)			2,540,000	2,475,000
Options outstanding ( in shares)					1,914,266
2007 Directors’ Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding ( in shares)					36,579
Non-qualified stock options outstanding (in shares)												3,000
Restricted stock outstanding (in shares)								1,200
2017 Outside Director's Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of stock options and restricted stock units granted	$ 125,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration of stock options					7 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration of stock options					10 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option compensation cost not yet recognized					$ 4,000,000.0
Future period of stock option expense recognition (in years)					1 year 3 months 18 days
Granted (in shares)					177,867	139,111	178,461
Conversion ratio (in shares)					1
Restricted Stock Units (RSUs) | Directors Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period from award (in shares)					9,905
Restricted Stock Units (RSUs) | Plan 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					151,693
Restricted Stock Units (RSUs) | Management Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock remaining authorized (in shares)					230,149
Stock option compensation cost not yet recognized					$ 100,000
Future period of stock option expense recognition (in years)					1 year 3 months 18 days
Deferred rate for annual cash bonus payment					100.00%
Quarterly basis discount rate of common stock on closing price					25.00%
Minimum deferral period					3 years
Fair value of shares vested					$ 5.8	$ 4,900,000	$ 2,800,000
Granted (in shares)					193,016
Shares issued during period from award (in shares)					5,665
Conversion ratio (in shares)					1
Restricted Stock Units (RSUs) | 2017 Outside Director's Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock allocation of awards as a percent		100.00%
Stock Units And Restricted Stock Units | Plan 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period from award (in shares)					111,774
Stock Units And Restricted Stock Units | Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period from award (in shares)					48,453
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock remaining authorized (in shares)					69,465
Quarterly basis discount rate of common stock on closing price					15.00%