Comprehensive Income - Schedule of Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,898,813	$ 1,759,242	$ 1,872,139	$ 1,737,325
Ending balance	1,949,785	1,782,865	1,949,785	1,782,865
Accumulated Other Comprehensive Loss, Net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(87,851)	(104,860)	(86,243)	(107,671)
Unrealized gains arising during the period	902	4,456	(692)	7,317
Reclassification of realized net gains to net income	(11)	(97)	(25)	(147)
Ending balance	(86,960)	(100,501)	(86,960)	(100,501)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(95,440)	(113,207)	(93,904)	(116,004)
Unrealized gains arising during the period	856	4,426	(680)	7,223
Reclassification of realized net gains to net income	0	0	0	0
Ending balance	(94,584)	(108,781)	(94,584)	(108,781)
Deferred Compensation and Pension Plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	7,590	8,320	7,604	8,370
Unrealized gains arising during the period	0	0	0	0
Reclassification of realized net gains to net income	(11)	(97)	(25)	(147)
Ending balance	7,579	8,223	7,579	8,223
Unrealized (Losses) Gains on Marketable Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1)	27	57	(37)
Unrealized gains arising during the period	46	30	(12)	94
Reclassification of realized net gains to net income	0	0	0	0
Ending balance	$ 45	$ 57	$ 45	$ 57