Retirement Plans - Changes in and Status of Defined Benefit Plans' Assets and Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
CHANGE IN PLAN ASSETS
Fair value of plan assets, beginning of year	$ 646,714
Fair value, end of year	488,662	$ 646,714
US
CHANGE IN PLAN ASSETS
Fair value of plan assets, beginning of year	204,455	237,129
Actual return on plan assets	(5,953)	(21,257)
Employer contributions	3,701	3,812
Employee contributions	0	0
Settlements	0	0
Benefits paid	(15,596)	(15,229)
Foreign currency rate changes	0	0
Fair value, end of year	186,607	204,455	$ 237,129
CHANGE IN PROJECTED BENEFIT OBLIGATION
Benefit obligation, beginning of year	(249,570)	(302,632)
Service cost	0	0	0
Interest cost	(11,242)	(9,451)	(9,504)
Actuarial gains	9,328	47,284
Benefits paid	15,596	15,229
Foreign currency rate changes	0	0
Settlements and other	0	0
Benefit obligation, end of year	(235,888)	(249,570)	(302,632)
Underfunded status, end of year	(49,281)	(45,115)
AMOUNTS RECOGNIZED ON THE STATEMENT OF FINANCIAL POSITION
Noncurrent assets	0	0
Current pension liability	(3,557)	(3,545)
Noncurrent pension liability	(45,724)	(41,570)
Net amount recognized in statement of financial position	(49,281)	(45,115)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial losses	(84,367)	(80,114)
Prior service cost gains (losses)	1,792	1,946
Total accumulated other comprehensive loss	(82,575)	(78,168)
Change in accumulated other comprehensive loss	(4,407)	16,345
INFORMATION FOR PENSION PLANS WITH AN ACCUMULATED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS [Abstract]
Accumulated benefit obligation	235,888	249,570
Fair value of plan assets	186,607	204,455
INFORMATION FOR PENSION PLANS WITH A PROJECTED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS
Projected benefit obligation	235,888	249,570
Fair value of plan assets	$ 186,607	$ 204,455
WEIGHTED AVERAGE ASSUMPTIONS USED IN DETERMINING ASSETS AND LIABILITIES
Discount rate	5.10%	4.60%
Accumulated benefit obligations	$ (235,888)	$ (249,570)
Non-US
CHANGE IN PLAN ASSETS
Fair value of plan assets, beginning of year	442,259	523,886
Actual return on plan assets	(133,855)	(37,543)
Employer contributions	11,600	12,595
Employee contributions	0	0
Settlements	(394)	0
Benefits paid	(10,458)	(10,703)
Foreign currency rate changes	(7,097)	(45,976)
Fair value, end of year	302,055	442,259	523,886
CHANGE IN PROJECTED BENEFIT OBLIGATION
Benefit obligation, beginning of year	(474,802)	(609,614)
Service cost	(796)	(1,196)	(1,396)
Interest cost	(13,389)	(11,148)	(8,901)
Actuarial gains	127,635	84,746
Benefits paid	10,458	10,703
Foreign currency rate changes	5,416	51,660
Settlements and other	2,470	47
Benefit obligation, end of year	(343,008)	(474,802)	$ (609,614)
Underfunded status, end of year	(40,953)	(32,543)
AMOUNTS RECOGNIZED ON THE STATEMENT OF FINANCIAL POSITION
Noncurrent assets	830	5,855
Current pension liability	(1,203)	(1,346)
Noncurrent pension liability	(40,580)	(37,052)
Net amount recognized in statement of financial position	(40,953)	(32,543)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial losses	(197,701)	(171,274)
Prior service cost gains (losses)	(1,058)	(1,165)
Total accumulated other comprehensive loss	(198,759)	(172,439)
Change in accumulated other comprehensive loss	(26,320)	42,818
INFORMATION FOR PENSION PLANS WITH AN ACCUMULATED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS [Abstract]
Accumulated benefit obligation	35,068	37,801
Fair value of plan assets	496	475
INFORMATION FOR PENSION PLANS WITH A PROJECTED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS
Projected benefit obligation	335,109	38,871
Fair value of plan assets	$ 293,326	$ 475
WEIGHTED AVERAGE ASSUMPTIONS USED IN DETERMINING ASSETS AND LIABILITIES
Discount rate	4.80%	3.00%
Rate of compensation increase	3.00%	3.10%
Accumulated benefit obligations	$ (329,329)	$ (450,037)