Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	$ 17,700	$ 17,800
Unrecognized net actuarial loss	$ 3,000	$ 2,900
Expected return on plan assets	5.20%	4.80%
Expected contributions next twelve months	$ 800
Expected contributions in year one	4,400
Expected contributions in year two	4,600
Expected contributions in year three	4,800
Expected contributions in year four	4,900
Expected contributions in year five	5,000
Expected contributions thereafter	54,000
Fair value of plan assets	60,038	$ 66,723	$ 78,244
Projected benefit obligation	77,739	84,546	99,728
Employer contributions	0	87
Supplemental Executive Retirement Plan (SERP)
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 12,300	10,500	9,100
United States Plan
Defined Benefit Plan Disclosure [Line Items]
Required years of service for plan eligibility	1 year
Employer contributions	$ 99,100	85,000	75,600
Canada | DPSP and RRSP
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	3,700	3,400	$ 3,100
Pension Plan of Immaterial Acquisitions
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,800	8,400
Projected benefit obligation	$ 6,900	$ 7,500