Capital Stock and Stock-Based Awards - Schedule of Stock Unit and Restricted Stock Unit activity (Details) - Stock Units And Restricted Stock Units	12 Months Ended
	May 31, 2022 $ / shares shares
Restricted stock units and MSPP RSUs
Nonvested, beginning balance (in shares) | shares	217,098
Granted (in shares) | shares	212,222
Vested (in shares) | shares	(139,891)
Forfeited (in shares) | shares	(1,370)
Nonvested ending balance (in shares) | shares	288,059
Weighted Average grant date fair value
Nonvested, beginning balance (in dollars per share) | $ / shares	$ 22.80
Granted (in dollars per share) | $ / shares	30.23
Vested (in dollars per share) | $ / shares	19.67
Forfeited (in dollars per share) | $ / shares	32.85
Nonvested, ending balance (in dollars per share) | $ / shares	$ 29.61