Employee Benefit Plans - Reconciliation of Changes in Projected Benefit Obligation and Fair Value of Plan Assets and Funded Status of Defined-benefit Plans (Detail) - USD ($)	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Change in benefit obligation
Interest cost	$ 899,000	$ 965,000	$ 1,174,000
Change in plan assets
Return on plan assets	885,000	1,195,000	2,328,000
Fair value, end of year	0
Pension Benefit
Change in benefit obligation
Benefit obligation, beginning of year	19,533,000	31,253,000
Interest cost	899,000	965,000
Actuarial gain	(1,705,000)	(2,328,000)
Benefits paid	(554,000)	(911,000)
Settlements	(18,173,000)	(9,446,000)
Benefits obligation, end of year	0	19,533,000	31,253,000
Change in plan assets
Fair value, beginning of year	18,041,000	27,210,000
Return on plan assets	(227,000)	(662,000)
Company contributions	914,000	1,850,000
Benefits paid	(555,000)	(911,000)
Settlements	(18,173,000)	(9,446,000)
Fair value, end of year	0	18,041,000	$ 27,210,000
Funded status	0	(1,492,000)
Other Liabilities | Pension Benefit
Amounts recognized in our consolidated balance sheets consist of:
Amounts recognized in our consolidated balance sheets	0	(1,492,000)
AOCI | Pension Benefit
Amounts recognized in our consolidated balance sheets consist of:
Amounts recognized in our consolidated balance sheets	$ 0	$ 8,867,000